Apply a generic thumbnail style to work package table cell

app/assets/stylesheets/content/work_packages/_table_content.sass

@@ -154,7 +154,6 @@ body.-browser-edge
     height: 22px !important
     line-height: 22px !important
 
-
 .inplace-editing--container
   display: inline-block
   border: 1px solid transparent
@@ -162,8 +161,10 @@ body.-browser-edge
   overflow: visible
   width: 100%
 
-
 // Special width rules for more or less fixed with fields
 .wp-table--cell-td.startDate,
 .wp-table--cell-td.dueDate
   width: 160px
+
+.wp-table--cell-td img.thumbnail
+  height: 40px

frontend/src/app/modules/bcf/fields/display/bcf-thumbnail-field.module.ts

@@ -36,7 +36,7 @@ export class BcfThumbnailDisplayField extends DisplayField {
     if (_.get(this, 'resource.bcf.viewpoints[0]')) {
       let vp = this.resource.bcf.viewpoints[0];
       element.innerHTML = `
-        <img src="${this.pathHelper.attachmentDownloadPath(vp.id, vp.file_name)}" style="height: 40px;">
+        <img src="${this.pathHelper.attachmentDownloadPath(vp.id, vp.file_name)}" class="thumbnail">
       `;
     } else {
       element.innerHTML = '';