reallife-gamemode/ReallifeGamemode.Client/assets/chat/style/checkbox.css

input[type=checkbox].css-checkbox{position:absolute;z-index:-1000;left:-1000px;overflow:hidden;clip:rect(0 0 0 0);height:1px;width:1px;margin:-1px;padding:0;border:0;}input[type=checkbox].css-checkbox+label.css-label{height:20px;width:20px;display:inline-block;background-repeat:no-repeat;background-position:0 0;cursor:pointer;}input[type=checkbox].css-checkbox:checked+label.css-label:after{content:'x';color:white;}label.css-label{background:#7b3784;border-radius:2px;-webkit-touch-callout:none;-webkit-user-select:none;-khtml-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;}