Simple CSS checkbox

checkbox.scss

// Copyright (c) 2017, Herman Bergwerf. All rights reserved.
// Use of this source code is governed by a MIT-style license
// that can be found in the LICENSE file.

.checkbox {
  font-family: KaTeX_Main;
  user-select: none;
  padding: .3em;

  &:before {
    content: '✓';
    display: inline-block;
    vertical-align: text-bottom;
    margin-right: .5em;
    padding-left: .05em;
    width: .95em;
    height: 1em;
    line-height: 1.2em;
    text-align: center;
    border: 1px solid #000;
    color: rgba(0, 0, 0, 0);
  }

  &:hover {
    cursor: pointer;

    &:before {
      color: rgba(0, 0, 0, .2);
    }
  }

  &.checked:before {
    color: rgba(0, 0, 0, 1);
  }

  &:focus {
    outline: 1px dotted;
    background: #f5f5f5;
  }
}