html { 
    background:              url(intro-1578424593.jpg) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size:    cover;
    -o-background-size:      cover;
    background-size:         cover;

    font-family:             Helvetica, sans-serif;
}

div {
    height: 100px;
    width:  300px;

    position:     fixed;
    top:          55%;
    left:         50%;
    margin-top:  -50px;
    margin-left: -150px;
    text-align:   center;
    
}
h1 {
    color:            white;
    background-color: black;
    padding-top:      20px;
    padding-bottom:   20px;
}