Colorful Background Gradient
CSS for a striking rainbow gradient background...
<style>
.viewport {
background:
linear-gradient(45deg, hsla(352, 96%, 45%, 1) 0%, hsla(352, 96%, 45%, 0) 70%),
linear-gradient(135deg, hsla(253, 95%, 42%, 1) 10%, hsla(253, 95%, 42%, 0) 80%),
linear-gradient(225deg, hsla(179, 91%, 45%, 1) 10%, hsla(179, 91%, 45%, 0) 80%),
linear-gradient(315deg, hsla(119, 96%, 49%, 1) 100%, hsla(119, 96%, 49%, 0) 70%);
}
</style>