Multiple UI improvements (#3317)

Removing break all

Replacing jquery selectors and some other UI improvements

Removing jquery selector

webapp/sass/components/_dropdown.scss

@@ -1,6 +1,7 @@
 @charset 'UTF-8';
 
 .dropdown-menu {
+    border-radius: $border-rad;
 
     &.colorpicker {
         z-index: 2500;

webapp/sass/components/_modal.scss

@@ -29,6 +29,14 @@
         }
     }
 
+    .row--invite {
+        .col-sm-6 {
+            &:first-child {
+                padding-right: 0;
+            }
+        }
+    }
+
     .modal__hint {
         @include opacity(.8);
         display: block;
@@ -194,8 +202,8 @@
         }
 
         .modal-content {
-            border-radius: 0;
-            box-shadow: none;
+            @include box-shadow(0 0 10px rgba($black, .5));
+            border-radius: $border-rad;
         }
 
         .modal-chevron-icon {
@@ -417,24 +425,6 @@
         }
     }
 
-
-    .invite {
-        margin-right: 40px;
-    }
-
-    .row--invite {
-        @include clearfix;
-        margin-right: 40px;
-
-        .col-sm-6 {
-            padding: 0 0 0 15px;
-
-            &:first-child {
-                padding-left: 0;
-            }
-        }
-    }
-
     .more-modal {
         .user-list {
             margin-top: 10px;