html,
body,
  {
    font-family: Roboto;
    font-size: 13px;
  }

  .ngonngu {
      position: relative; width: 112px;
      -webkit-user-select:none; -moz-user-select:none; -ms-user-select: none;
  }
  .ngonngu-checkbox {
      display: none;
  }
  .ngonngu-label {
      display: block; overflow: hidden; cursor: pointer;
      border: 2px solid #999999; border-radius: 20px;
  }
  .ngonngu-inner {
      display: block; width: 200%; margin-left: -100%;
      transition: margin 0.3s ease-in 0s;
  }
  .ngonngu-inner:before, .ngonngu-inner:after {
      display: block; float: left; width: 50%; height: 26px; padding: 0; line-height: 26px;
      font-size: 14px; color: white; font-family: Trebuchet, Arial, sans-serif; font-weight: bold;
      box-sizing: border-box;
  }
  .ngonngu-inner:before {
      content: "English";
      padding-left: 8px;
      background-color: #A3A3A3; color: #000000;
  }
  .ngonngu-inner:after {
      content: "Tiếng Việt";
      padding-right: 7px;
      background-color: #EEEEEE; color: #000000;
      text-align: right;
  }
  .ngonngu-ngonngu {
      display: block; width: 30px; margin: 0px;
      background: #FFFFFF;
      position: absolute; top: 0; bottom: 0;
      right: 82px;
      border: 2px solid #999999; border-radius: 20px;
      transition: all 0.3s ease-in 0s;
  }
  .ngonngu-checkbox:checked + .ngonngu-label .ngonngu-inner {
      margin-left: 0;
  }
  .ngonngu-checkbox:checked + .ngonngu-label .ngonngu-ngonngu {
      right: 0px;
  }