html
{
    background-image: url("../bg.png");
}
body 
{
    width: 60%;
    padding: 20px;
    margin: auto;
    color : #FFFFFF;
    background-color : #000;
    font-family : Verdana;
    border: 3px solid #456;
    border-radius: 20px;
}
div
{
    width: 80%;
    margin:auto;
    background-color: #000000;
}
@media only screen and (max-device-width: 480px)
{
    body
    {
        width: 100%;
        border-radius: 0px;
        border: none;
    }
}