body{
    background-image:url(../images/fondo.jpg);
    background-size: 100vw 100vh;
    background-attachment: fixed;
    margin: 0;
}

form{
    width:580px;
    margin: auto;
    background: rgba(0,0,0,0.4);
    padding: 10px 20px;
    box-sizing:border-box;
    margin-top:20px;
    border-radius:7px;
}

h2{
    color: #fff;
    text-align:center;
    margin:0;
    font-size:30px;
    margin-bottom: 20px;
}

input, textarea{
    width:100%;
    margin-bottom: 20px;
    padding:10px;
    box-sizing:border-box;
    font-size:17px;
    border:none;
}

textarea{
    min-height:100px;
    max-height:200px;
    max-width:100%;
}

#boton{
    background:#31384A;
    color:#fff;
    padding: 20px;
}

#boton:hover{
    cursor:pointer;
}

@media (max-width:480px){
    form{
        width:100%;
    }
}