.bdcaptcha-input {
    margin-top:10px;
    width:280px;
}

@media screen and (min-width:768px) {
  .bdcaptcha-code {
        float:left;
        width:280px;
  }

  .bdcaptcha-input {
        margin-top:0;
        margin-left:285px;
        height:50px;
        width:auto;
  }
}