[editor] Remove margin from element toolbox panel

projects/editor/src/app/components/unit-view/page-view/ui-element-toolbox/ui-element-toolbox.component.ts

@@ -7,7 +7,6 @@ import { SelectionService } from '../../../../selection.service';
   selector: 'app-ui-element-toolbox',
   templateUrl: './ui-element-toolbox.component.html',
   styles: [
-    ':host {background-color: #F9FBFB; margin-left: 1px}',
     ':host {text-align: center; font-size: larger}',
     ':host button {text-align: left; font-size: large; margin: 5px}',
     ':host ::ng-deep .mat-tab-label {min-width: 0}',