.asp-field {
    height:1px;
    opacity: 0.01;
    overflow:hidden;
}

#i-am-human {
    padding: 5px;
    background: #999;
    transition: 0.3s ease-in;
    margin:10px 0;
    cursor:pointer;
    border:none;
    display:block;
    text-align:center;
}

#i-am-human.ok-go {
    background: #666;
    color: #fff;
}

#i-am-human.clicked {
    background: darkgreen;
}