MAGETWO-89659: Address comments / feedback from review

 - fix bugs and stylings

Author: Robert He

app/design/adminhtml/Magento/backend/web/css/source/_components.less

@@ -23,4 +23,4 @@
 @import 'components/_image-uploader.less';
 @import 'components/_slider.less';
 @import 'components/_url_input.less';
-@import 'components/_color-picker.less;
+@import 'components/_color-picker.less';