Implement search on front end

less/lib/search.less

@@ -0,0 +1,82 @@
+.search-box {
+  & input:focus, &.active input, & .search-results {
+    width: 400px;
+  }
+}
+.search-results {
+  max-height: 70vh;
+  overflow: auto;
+
+  & > li > a {
+    white-space: normal;
+
+    &:hover {
+      background: none;
+    }
+  }
+
+  & mark {
+    background: none;
+    padding: 0;
+    font-weight: bold;
+    color: inherit;
+    box-shadow: none;
+  }
+}
+
+.search-input {
+  overflow: hidden;
+  color: @fl-body-muted-color;
+
+  &:before {
+    .fa();
+    content: @fa-var-search;
+    float: left;
+    margin-right: -36px;
+    width: 36px;
+    font-size: 14px;
+    text-align: center;
+    position: relative;
+    padding: @padding-base-vertical - 1 0;
+    line-height: @line-height-base;
+    pointer-events: none;
+  }
+  & input {
+    float: left;
+    width: 225px;
+    padding-left: 36px;
+    padding-right: 36px;
+    .transition(~"all 0.4s");
+
+    .active & {
+      background: @fl-body-bg;
+      border: 2px solid @fl-body-secondary-color;
+
+      &:focus {
+        &:extend(.form-control:focus);
+      }
+    }
+  }
+  & .btn {
+    float: left;
+    margin-left: -36px;
+    width: 36px !important;
+    outline: none;
+  }
+}
+
+.discussion-search-result {
+  & .title {
+    margin-bottom: 3px;
+  }
+  & .excerpt {
+    color: @fl-body-muted-color;
+    font-size: 11px;
+  }
+}
+.user-search-result {
+  & .avatar {
+    .avatar-size(24px);
+    margin: -2px 10px -2px 0;
+  }
+}