[auth] fixed display of scopes in auth button, added highlight of empty field

src/main/less/auth.less

@@ -37,6 +37,28 @@
     }
   }
 
+  .authorize__btn_operation:hover .authorize-scopes {
+    display: block;
+  }
+  
+  .authorize-scopes {
+    position: absolute;
+    margin-top: 20px;
+    background: #FFF;
+    border: 1px solid #ccc;
+    border-radius: 5px;
+    display: none;
+    font-size: 13px;
+    max-width: 300px;
+    line-height: 30px;
+    color: black;
+    padding: 5px;
+
+    .authorize__scope {
+      text-decoration: none;
+    }
+  }
+
   .authorize__btn_operation {
     height: 18px;
     vertical-align: middle;

src/main/less/screen.less

@@ -160,6 +160,10 @@
     content: "+";
   }
 
+  .error {
+    outline-color: #cc0000;
+    background-color: #f2dede;
+  }
 }