.toolbar-button-with-text:before{display:block;top:3px;bottom:3px;left:3px;right:3px;position:absolute;text-align:center;font-size:20px;font-weight:500;line-height:30px;border-radius:4px}.toolbar-button-with-text:hover:before,.toolbar-button-with-text:focus:before{box-shadow: inset 0 0 0 1px #555d66, inset 0 0 0 2px #fff;color:#555d66}.toolbar-button-with-text.is-active:before{background:#555d66;color:#fff}.toolbar-button__advanced-sup:before{content:'x²'}.toolbar-button__advanced-sub:before{content:'x₂'}