diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 594ff89..ccc5efb 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,7 +1,18 @@
-## CONTRIBUTING
+## Contributing
 
 - Fork it ( https://github.com/stisla/stisla/fork )
 - Create your feature branch (`git checkout -b my-new-feature`)
 - Commit your changes (`git commit -am 'Add some feature'`)
 - Push to the branch (`git push origin my-new-feature`)
 - Create a new Pull Request
+
+## Note
+
+### CSS
+If you want to make some changes in the CSS style. Don't edit the `.css` file, use the SCSS file instead.
+
+### HTML
+Since we use Nunjucks, if you want to make changes to the HTML structure, make sure you change the source file (Nunjucks) located in `sources/pages`.
+
+### Important!
+It's better to use the code guide by [@mdo](http://codeguide.co). Before making a pull request, make sure you have compiled all source code such as SCSS, HTML and others. Most importantly, make sure your changes have been tested cross-browser and still use existing variables (if possible).
diff --git a/assets/js/scripts.js b/assets/js/scripts.js
index b372f48..7b31ac6 100644
--- a/assets/js/scripts.js
+++ b/assets/js/scripts.js
@@ -131,7 +131,7 @@ $(function() {
   }
 
   $(".main-content").css({
-    minHeight: $(window).outerHeight() - 95
+    minHeight: $(window).outerHeight() - 108
   })
 
   $(".nav-collapse-toggle").click(function() {
diff --git a/sources/scss/override/_form.scss b/sources/scss/override/_form.scss
index a24d462..35b3c1a 100644
--- a/sources/scss/override/_form.scss
+++ b/sources/scss/override/_form.scss
@@ -17,7 +17,7 @@ select.form-control:not([size]):not([multiple]),
 }
 
 textarea.form-control {
-  height: 64px !important;
+  height: 64px;
 }
 
 .custom-control {