body {
    background-image: url(3.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    background-attachment: fixed;
    font-family: monospace;
    margin: 0;
}

form {
    width: 450px;
    margin: auto;
    background: rgba(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: 30px;
}

input, textarea {
     width: 100%;
     margin-bottom: 20px;
     padding: 7px;
     box-sizing: border-box;
     font-size: 17px;
     border: none;
     color: rgb(182, 216, 128);
     
}

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

#boton {
    background: #31374a;
    color: #fff;
    padding: 20px;
}

#boton:hover {
    cursor: pointer;
}

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

h1  {
    text-align: center;
    color: #fff;
    font-size: 40px;
    background: rgba(0,0,0,0.4);
    margin-top: 40px;
}