<style>

body{
background: navy url(deepsea.jpg) top center no-repeat fixed;
background-size: cover;
height: 2000px;
}

#bubbles1, #bubbles2{
width: 100%;
height: 100%;
top: 0;
left: 0;
position: fixed;
z-index: -1;
background: url(bubbles1.jpg) 5% 50% no-repeat;
}

#bubbles2{
background: url(bubbles2.jpg) 95% 90% no-repeat;
}

div.credits{
text-align: right;
color: white;
}

div.credits a{
color: lightyellow;
text-decoration: none;
}

</style>