.form-group{
    height: auto;
}
#checkcode{
    width: 200px;
    margin-left: 15px;
}
.codeimg{
    float: left;
    margin-left: 15px;
}
.form-group .row .col-6{
    margin: 0px !important;
    float: left; 
}
.form-group .submit{
    color:#009aff ;
    float: left;
    margin: -15px 0 0 15px;
    color: #fff;
    background-color: #5bc0de;
    border-color: #46b8da;
    display: inline-block;
    padding: 6px 12px;
    margin-bottom: 0;
    font-size: 14px;
    font-weight: 400;
    line-height: 1.42857143;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    -ms-touch-action: manipulation;
    touch-action: manipulation;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    background-image: none;
    border: 1px solid transparent;
    border-radius: 4px;
}
.row form{
    max-height: 600px;
    height: 360px;
}