increase textarea fields height on focus

src/public/assets/theme/default/css/common.css

@@ -34,28 +34,32 @@ a:hover {
   transition: opacity .5s ease-in-out;
 }
 
+input,
+textarea {
+  background: #5d627d;
+  color: #ccc;
+  border: 0;
+  border-radius: 3px;
+  padding: 6px 8px;
+  font-size: 13px;
+}
+
 textarea:focus,
 input:focus {
   outline: none;
   color: #fff;
 }
 
+textarea:focus {
+  min-height: 120px;
+}
+
 textarea::placeholder,
 input::placeholder {
   color: #9698a5;
   opacity: 1;
 }
 
-input,
-textarea {
-  background: #5d627d;
-  color: #ccc;
-  border: 0;
-  border-radius: 3px;
-  padding: 6px 8px;
-  font-size: 13px;
-}
-
 input:hover,
 textarea:hover {
   background: #636884;