.dev{
    position:absolute;
    width:30px;
    height:30px;
    right:15px;
    top:180%;
    margin-top:-15px;
    background: transparent center center no-repeat url('http://nexdesigner.com.br/logo-mini.png');
    background-size: 70%;
    border:none;
    cursor:pointer;
    display: block;