Reimplemented changes from PR #3427. Added fix for validating request bodies.

src/style/_buttons.scss

@@ -14,6 +14,12 @@
 
     @include text_headline();
 
+    &.btn-sm
+    {
+        font-size: 12px;
+        padding: 4px 23px;
+    }
+
     &[disabled]
     {
         cursor: not-allowed;
@@ -165,6 +171,10 @@
 button
 {
     cursor: pointer;
-
     outline: none;
+
+    &.invalid
+    {
+        @include invalidFormElement();
+    }
 }

src/style/_form.scss

@@ -21,6 +21,10 @@ select
 
         background: #f7f7f7;
     }
+
+    &.invalid {
+        @include invalidFormElement();
+    }
 }
 
 .opblock-body select
@@ -55,10 +59,7 @@ input[type=file]
 
     &.invalid
     {
-        animation: shake .4s 1;
-
-        border-color: $_color-delete;
-        background: lighten($_color-delete, 35%);
+        @include invalidFormElement();
     }
 }
 

src/style/_mixins.scss

@@ -166,3 +166,9 @@ $browser-context: 16;
         @warn 'Breakpoint mixin supports: tablet, mobile, desktop';
     }
 }
+
+@mixin invalidFormElement() {
+    animation: shake .4s 1;
+    border-color: $_color-delete;
+    background: lighten($_color-delete, 35%);
+}

src/style/_table.scss

@@ -97,6 +97,10 @@ table
         width: 100%;
         max-width: 340px;
     }
+
+    select {
+        border-width: 1px;
+    }
 }
 
 .parameter__name