Restore missing styles

packages/grafana-ui/src/components/ColorPicker/_ColorPicker.scss

@@ -189,6 +189,14 @@ $arrowSize: 15px;
   z-index: 0;
 }
 
+.sp-preview-inner, .sp-alpha-inner, .sp-thumb-inner
+{
+    display:block;
+    position:absolute;
+    top:0;left:0;bottom:0;right:0;
+}
+
+
 .gf-color-picker__body {
   padding-bottom: $arrowSize;
   padding-left: 6px;