@mixin ame-indeterminate-checkbox { &:indeterminate:before { content: '\25a0'; //Unicode black square. Another option would be BLACK LARGE SQUARE (U+2B1B). color: #1e8cbe; //Large square. //margin: -6px 0 0 -1px; //font: 400 18px/1 dashicons; //Smaller square. margin: -3px 0 0 -1px; font: 400 14px/1 dashicons; //Even smaller square. //margin: -2px 0 0 -1px; //font: 400 13px/1 dashicons; float: left; display: inline-block; vertical-align: middle; width: 16px; -webkit-font-smoothing: antialiased; } }