Added styles for dropdown warning state

src/collections/form.less

@@ -288,6 +288,7 @@
   -moz-box-shadow: 0.3em 0em 0em 0em #D95C5C inset;
   box-shadow: 0.3em 0em 0em 0em #D95C5C inset;
 }
+
 .ui.form .field.error textarea:focus,
 .ui.form .field.error input[type="text"]:focus,
 .ui.form .field.error input[type="email"]:focus,
@@ -305,6 +306,45 @@
   box-shadow: 0.3em 0em 0em 0em #FF5050 inset;
 }
 
+/*----------------------------
+  Dropdown Selection Warning
+-----------------------------*/
+
+.ui.form .fields.error .field .ui.selection.dropdown,
+.ui.form .fields.error .field .ui.selection.dropdown .item,
+.ui.form .field.error .ui.selection.dropdown,
+.ui.form .field.error .ui.selection.dropdown .item {
+  background-color: #FFFAFA;
+  color: #D95C5C;
+}
+
+.ui.form .fields.error .field .ui.selection.dropdown,
+.ui.form .field.error .ui.selection.dropdown {
+  -webkit-box-shadow: 0px 0px 0px 1px #E7BEBE !important;
+  box-shadow: 0px 0px 0px 1px #E7BEBE !important;
+}
+
+.ui.form .fields.error .field .ui.selection.dropdown:hover,
+.ui.form .field.error .ui.selection.dropdown:hover {
+  -webkit-box-shadow: 0px 0px 0px 1px #E7BEBE !important;
+  box-shadow: 0px 0px 0px 1px #E7BEBE !important;
+}
+.ui.form .fields.error .field .ui.selection.dropdown:hover .menu,
+.ui.form .field.error .ui.selection.dropdown:hover .menu {
+  -webkit-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  -moz-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  box-shadow: 0px 1px 0px 1px #E7BEBE;
+}
+.ui.form .fields.error .field .ui.selection.dropdown .menu .item:hover,
+.ui.form .field.error .ui.selection.dropdown .menu .item:hover {
+  background-color: #FFF2F2;
+}
+
+.ui.form .fields.error .field .ui.selection.dropdown .menu .active.item,
+.ui.form .field.error .ui.selection.dropdown .menu .active.item {
+  background-color: #FDCFCF !important;
+}
+
 /*--------------------
   Empty (Placeholder)
 ---------------------*/

src/modules/dropdown.less

@@ -361,6 +361,35 @@
   margin-right: 0.5em;
 }
 
+/*--------------------
+        Error
+----------------------*/
+.ui.selection.dropdown.error,
+.ui.selection.dropdown.error .item {
+  background-color: #FFFAFA;
+  color: #D95C5C;
+}
+.ui.selection.dropdown.error {
+  -webkit-box-shadow: 0px 0px 0px 1px rgba(231, 190, 190, 1) !important;
+  box-shadow: 0px 0px 0px 1px rgba(231, 190, 190, 1) !important;
+}
+
+.ui.selection.dropdown.error .menu {
+  -webkit-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  -moz-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  box-shadow: 0px 1px 0px 1px #E7BEBE;
+
+  -moz-border-radius: 0px 0px 0.325em 0.325em;
+  -webkit-border-radius: 0px 0px 0.325em 0.325em;
+  border-radius: 0px 0px 0.325em 0.325em;
+}
+
+
+/* Menu Item Active */
+.ui.selection.dropdown.error .menu .active.item {
+  background-color: #FDCFCF !important;
+}
+
 /* Hover */
 .ui.selection.dropdown:hover {
   -webkit-box-shadow: 0px 0px 0px 1px rgba(0, 0, 0, 0.2) !important;
@@ -375,6 +404,18 @@
 .ui.selection.dropdown:hover > .dropdown.icon {
   opacity: 1;
 }
+.ui.selection.dropdown.error:hover {
+  -webkit-box-shadow: 0px 0px 0px 1px rgba(231, 190, 190, 1) !important;
+  box-shadow: 0px 0px 0px 1px rgba(231, 190, 190, 1) !important;
+}
+.ui.selection.dropdown.error:hover .menu {
+  -webkit-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  -moz-box-shadow: 0px 1px 0px 1px #E7BEBE;
+  box-shadow: 0px 1px 0px 1px #E7BEBE;
+}
+.ui.selection.dropdown.error .menu .item:hover {
+  background-color: #FFF2F2;
+}
 
 /* Visible */
 .ui.visible.selection.dropdown {
@@ -384,7 +425,6 @@
 
 /* Active */
 .ui.active.selection.dropdown {
-
   -webkit-border-radius: 0.3125em 0.3125em 0em 0em !important;
   -moz-border-radius: 0.3125em 0.3125em 0em 0em !important;
   border-radius: 0.3125em 0.3125em 0em 0em !important;