Board Thread:Support Requests - Getting Technical/@comment-31714129-20170711213636/@comment-27958705-20170711225442

Through css u can only set additional image, u can't replace existing labels.

.mw-collapsible-toggle-collapsed:before { background-image: url(img); padding-left: 10px; content: ""; background-size: contain; background-repeat: no-repeat; } same to expanded: .mw-collapsible-toggle-expanded:before { background-image: url(img); padding-left: 10px; content: ""; background-size: contain; background-repeat: no-repeat; } Padding used to create place for image.