body{background-color:white;}
h1{color:red;font-size:70px;text-align:center}
h2{color:blue;font-size:40px;text-align:center}
body{width: expression ( document.body.clientWidth < 1000 ? "1000px" : "auto");
min-width: 1000px;}

.under{
    min-height: 100vh;
    position: relative;
    padding-bottom: 120px;
    box-sizing: border-box;
}

footer{
    width: 100%;
    text-align: center;
    padding: 30px 0;

 position: absolute;
    bottom: 0; 
}