mdb-ui-kit/less/_togglebutton.less

.togglebutton {
  vertical-align: middle;
  &, label, input, .toggle {
    user-select: none;
  }
  label {
    cursor: pointer;
    color: @mdb-toggle-label-color;
    .mdb-label-color-toggle-focus();

    // Hide original checkbox
    input[type=checkbox] {
      opacity: 0;
      width: 0;
      height: 0;
    }

    .toggle {
      text-align: left; // Issue #737 horizontal form
    }
    // Switch bg off and disabled
    .toggle,
    input[type=checkbox][disabled] + .toggle {
      content: "";
      display: inline-block;
      width: 30px;
      height: 15px;
      background-color: rgba(80, 80, 80, 0.7);
      border-radius: 15px;
      margin-right: 15px;
      transition: background 0.3s ease;
      vertical-align: middle;
    }
    // Handle off
    .toggle:after {
      content: "";
      display: inline-block;
      width: 20px;
      height: 20px;
      background-color: #F1F1F1;
      border-radius: 20px;
      position: relative;
      box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.4);
      left: -5px;
      top: -2px;
      transition: left 0.3s ease, background 0.3s ease, box-shadow 0.1s ease;
    }
    input[type=checkbox] {
      // Handle disabled
      &[disabled] {
        & + .toggle:after,
        &:checked + .toggle:after {
          background-color: #BDBDBD;
        }
      }

      & + .toggle:active:after,
      &[disabled] + .toggle:active:after {
        box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.4), 0 0 0 15px rgba(0, 0, 0, 0.1);
      }

      // Ripple off and disabled
      &:checked + .toggle:after {
        left: 15px;
      }
    }

    // set bg when checked
    input[type=checkbox]:checked {
      + .toggle {
        background-color: fade(@brand-primary, 50%); // Switch bg on
      }

      + .toggle:after {
        background-color: @brand-primary; // Handle on
      }

      + .toggle:active:after {
        box-shadow: 0 1px 3px 1px rgba(0, 0, 0, 0.4), 0 0 0 15px fade(@brand-primary, 10%); // Ripple on
      }
    }
  }
}