body{background:linear-gradient(navy, blue,navy,blue);background-repeat:no-repeat;background-attachment: fixed;}


.maindiv{width:85%;
    height:auto;
    background-image:url(images/spacebg.gif);
    margin-right: auto;
    margin-left: auto;
    margin-top: 20px;
    min-height:300px;
    border:1px black solid;border-radius:20px

}

    .center{margin-left:auto;margin-right:auto;display:block;font-family: sans-serif;}

    h3{text-align:center;color:antiquewhite;max-width: 500px;margin-left:auto;margin-right:auto;padding:5px;
    }

    h1{text-align:center;color:rgb(143, 16, 16);max-width: 500px;margin-left:auto;margin-right:auto;padding:5px;
    }