.captcha-group {
  position: relative;
  input[type=number]::-webkit-inner-spin-button, 
  input[type=number]::-webkit-outer-spin-button { 
    -webkit-appearance: none; 
    margin: 0; 
  }
  .captcha {
    cursor: pointer;
    width: 76px;
    border-radius: 0 3px 3px 0;
    overflow: hidden;
    position: absolute;
    right: 1px;
    bottom: 1px;
    background-color: #eee;
    height: 30px;
    line-height: 30px;
    @include layoutCenter();
    z-index: 1;
    .captcha-tip {
      @include fill();
      background-color: #f1f1f1;
      color: #000;
    }
    img {
      width: 100%;
      height: auto;
    }
  }
}