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feat: Update contents
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Phuoc Nguyen
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contents/dropdown.mdx
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271
contents/dropdown.mdx
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---
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category: Navigation
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created: '2019-11-29'
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description: Create a dropdown with CSS
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keywords: css dropdown, css menu
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thumbnail: /assets/css-layout/thumbnails/dropdown.png
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title: Dropdown
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---
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## HTML
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```html
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<div class="dropdown">
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<!-- The trigger element -->
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<div class="dropdown__trigger">...</div>
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<!-- The content -->
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<div class="dropdown__content">...</div>
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</div>
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```
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## CSS
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```css
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.dropdown {
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position: relative;
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}
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.dropdown__trigger {
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cursor: pointer;
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}
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/* Hide the dropdown's content by default */
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.dropdown__content {
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display: none;
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/* Position it right below the trigger element */
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left: 0;
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padding-top: 0.25rem;
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position: absolute;
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top: 100%;
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/* It should be on the top of other elements */
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background-color: #fff;
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z-index: 9999;
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}
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/* Show the content when hover on the container */
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.dropdown:hover .dropdown__content {
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display: block;
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}
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```
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You can use a [triangle button](https://phuoc.ng/collection/css-layout/triangle-buttons) to indicate that there is content under it.
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Move the mouse over the button to see the dropdown.
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<Playground>
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```css placeholders.css hidden
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.lines {
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padding: 0.25rem 0;
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width: 100%;
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align-items: center;
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display: flex;
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justify-content: center;
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flex-direction: column;
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}
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.line {
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background: #d1d5db;
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height: 1px;
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margin-bottom: 0.25rem;
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}
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.line.line--20 {
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width: 20%;
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}
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.line.line--40 {
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width: 40%;
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}
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.line.line--60 {
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width: 60%;
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}
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.line.line--80 {
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width: 80%;
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}
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.line.line--100 {
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width: 100%;
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}
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.rectangle {
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background: #d1d5db;
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border-radius: 0.25rem;
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height: var(--rectangle-height);
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width: var(--rectangle-width);
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}
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.rectangle--hor.rectangle--20 {
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--rectangle-width: 20%;
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}
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.rectangle--hor.rectangle--40 {
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--rectangle-width: 40%;
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}
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.rectangle--hor.rectangle--60 {
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--rectangle-width: 60%;
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}
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.rectangle--hor.rectangle--80 {
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--rectangle-width: 80%;
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}
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.rectangle--hor.rectangle--100 {
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--rectangle-width: 100%;
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}
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.rectangle--hor.rectangle--sm {
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--rectangle-height: 0.5rem;
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}
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.rectangle--hor.rectangle--md {
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--rectangle-height: 2rem;
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}
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.rectangle--hor.rectangle--lg {
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--rectangle-height: 4rem;
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}
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.rectangle--ver.rectangle--20 {
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--rectangle-height: 20%;
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}
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.rectangle--ver.rectangle--40 {
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--rectangle-height: 40%;
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}
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.rectangle--ver.rectangle--60 {
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--rectangle-height: 60%;
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}
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.rectangle--ver.rectangle--80 {
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--rectangle-height: 80%;
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}
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.rectangle--ver.rectangle--100 {
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--rectangle-height: 100%;
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}
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.rectangle--ver.rectangle--sm {
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--rectangle-width: 0.5rem;
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}
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.rectangle--ver.rectangle--md {
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--rectangle-width: 2rem;
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}
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.rectangle--ver.rectangle--lg {
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--rectangle-width: 4rem;
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}
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.triangle {
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border-style: solid;
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height: 0;
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width: 0;
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}
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.triangle--t {
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border-color: transparent transparent #d1d5db transparent;
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border-width: 0 var(--triangle-size) var(--triangle-size) var(--triangle-size);
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}
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.triangle--r {
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border-color: transparent transparent transparent #d1d5db;
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border-width: var(--triangle-size) 0 var(--triangle-size) 1rem;
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}
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.triangle--b {
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border-color: #d1d5db transparent transparent transparent;
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border-width: var(--triangle-size) var(--triangle-size) 0 var(--triangle-size);
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}
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.triangle--l {
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border-color: transparent #d1d5db transparent transparent;
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border-width: var(--triangle-size) 1rem var(--triangle-size) 0;
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}
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.triangle--tr {
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border-color: transparent #d1d5db transparent transparent;
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border-width: 0 var(--triangle-size) var(--triangle-size) 0;
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}
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.triangle--br {
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border-color: transparent transparent #d1d5db transparent;
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border-width: 0 0 var(--triangle-size) var(--triangle-size);
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}
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.triangle--bl {
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border-color: transparent transparent transparent #d1d5db;
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border-width: var(--triangle-size) 0 0 var(--triangle-size);
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}
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.triangle--tl {
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border-color: #d1d5db transparent transparent transparent;
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border-width: var(--triangle-size) var(--triangle-size) 0 0;
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}
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.triangle--sm {
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--triangle-size: 0.5rem;
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}
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.triangle--md {
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--triangle-size: 2rem;
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}
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.triangle--lg {
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--triangle-size: 4rem;
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}
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```
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```css styles.css hidden
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body {
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align-items: center;
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display: flex;
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justify-content: center;
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height: 24rem;
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}
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.dropdown {
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position: relative;
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/* Demo */
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width: 6rem;
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align-items: flex-start;
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display: flex;
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justify-content: center;
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}
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.dropdown__trigger {
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cursor: pointer;
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/* Demo */
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border: 1px solid #d1d5db;
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border-radius: 0.25rem;
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height: 2rem;
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width: 6rem;
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padding: 0.25rem 0.5rem;
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align-items: center;
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display: flex;
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justify-content: center;
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}
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/* Hide the dropdown's content by default */
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.dropdown__content {
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display: none;
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/* Position it right below the trigger element */
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left: 0;
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padding-top: 0.25rem;
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position: absolute;
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top: 100%;
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/* It should be on the top of other elements */
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background-color: #fff;
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z-index: 9999;
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}
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.dropdown__body {
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/* Demo */
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border: 1px solid #d1d5db;
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border-radius: 0.25rem;
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height: 6rem;
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width: 8rem;
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}
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/* Show the content when hover on the container */
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.dropdown:hover .dropdown__content {
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display: block;
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}
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```
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```html index.html hidden
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<div class="dropdown">
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<div class="dropdown__trigger">
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<div class="rectangle rectangle--hor rectangle--sm rectangle--100"></div>
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<div class="triangle triangle--b triangle--sm"></div>
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</div>
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<div class="dropdown__content">
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<div class="dropdown__body">
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<div class="lines">
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<div class="line line--80"></div>
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<div class="line line--40"></div>
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<div class="line line--100"></div>
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<div class="line line--60"></div>
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<div class="line line--20"></div>
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</div>
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</div>
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</div>
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</div>
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```
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</Playground>
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