LoadingIndicator: refactor styles, improve look of ColumnLoading

app/soapbox/features/ui/components/column_loading.js

@@ -1,7 +1,6 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-
-import Column from '../../../components/column';
+import Column from './column';
 import ColumnHeader from '../../../components/column_header';
 import ImmutablePureComponent from 'react-immutable-pure-component';
 import LoadingIndicator from 'soapbox/components/loading_indicator';
@@ -23,7 +22,9 @@ export default class ColumnLoading extends ImmutablePureComponent {
     return (
       <Column>
         <ColumnHeader icon={icon} title={title} focusable={false} />
-        <LoadingIndicator />
+        <div className='column-loading'>
+          <LoadingIndicator />
+        </div>
       </Column>
     );
   }