body{
    overflow: auto;
}
.container{
    width: 900px;
    height: 100%;
    margin: 0 auto;
}
#contact-form{
    width: 800px;
    height: 100%;
}
@media (max-width: 768px){
    #contact-form{
        width: 500px;
        height: 100%;
    }
}
@media (max-width: 450px){
    #contact-form{
        width: 400px;
        height: 100%;
    }
}