.toolbar-icon-abtestui-second-test-list:before {
  background-image: url(/modules/custom/bupo_abtest/img/ABtestUI-icon.svg) !important;
  mask-image: url(/modules/custom/bupo_abtest/img/ABtestUI-icon.svg) !important;
  -webkit-mask-image: url(/modules/custom/bupo_abtest/img/ABtestUI-icon.svg) !important;
}