*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

html,
body{
    width:100%;
    height:100%;
}

body{

    background:url("images/smile.png");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
    background-color: #f6d2a4;
}

@media (max-width: 768px) {

    body {
        background-image: url("images/smile-mobile.png");
        background-position: center center;
    }
}