.tool-insert-math {
  display: inline-block;
  width: 20px;
  height: 20px;
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAADG0lEQVRYR+1WSYgTQRR91Rc9zElREfSgDB7Sv1pzUVFxQWHwIriBC4ILeBBEBQ+iBx0QPKgogidxOaggiAsuIIgLonEQQamf5OBCxJsgCiOoZFJfKlSHnpikMxnCIFiXpLv+f+/9Vz/1ozDGS40xP/5tAVEULR8aGpoeBMFUAN9EpBQEQWlwcLBUKpV+teNuRw5EUTRPRPaIyMYmJMuY+UlXBLiqrbUPU8C7IyCKosnW2ucAer2A+yJyE8CLfD5fIKIIwGwAn7viQBiGe5VSpxy5UupZT09PXy6X+9mO1c1iRtQDRJQDMN+BWWvnFwqFgdGQVwtpFyAMw16l1Dtf/YAxpipktKttAUS0H8BxT9jPzEdGS97UASJy4EvqCFzjTfPvkj+xpw1iTzLz3TifiNYA2B0/M/Oy+HtDB7yAw51WKCLX8/n8epevtV4hIncAjE8IqPF2RYAnWigiZaWUI5+SLIaZWwvQWq8XkYxPioNjR/qTYEqpvI91cS6nWrlS6pE7MhGZFfdNwoFa/7TVhFrr2yKyygOvNsbcanY8RPQVwIQ6kduNMRcb5aQKyGazk8rl8msA0wF8r1Qqc4rF4qdmArTWm0XkcmL/IDMfaxafKkBrvVJE7sfdn+zgRqBa6wMiUiO01m4rFAqXOhZARIcAHPX2nzbG7GtR/SYRuVK3b5jZzYiGK9UBIroOYK3P3sLMSXtroJlMZlEQBG5KjgPgBtREAIu98M3GmKud9EBARO8BzHDJlUplVrFYrF7HbhHR0gToeQAz3WS01vYFQbAAwAO/fw/ACRH54qbmsAZtZo17n8lk5gZBEA+cN8ycTcYTkdTlfwDQx8zu0wl8CyBp/19XeMsjCMNwl1LqrLfxnDFmZwsBPzz5izjG/XOy1r5M5IxYwEWl1FYPsIOZL9QJeJx4PsPM7uyHLSJyBcSX2tP6IdbSgcSl8lsplTHGfGx1ZJ3s/SXADyJ3la4TkdCDXmPmDZ0QpOU0ElDfWA5jLTPfSAPrZL8dAa+YeW4n4O3kND0Cl2ytLbW6RtshSItJvQnTAEa7/1/AHyXiNzDHur94AAAAAElFTkSuQmCC) center center no-repeat;
  background-size: 20px 20px;
}