Floating gradient (only css)

design based on "/gradient.css" on my site https://account.mirzaev.sexy (see for more updates)

File "/gradient.css" contains gradient css only!

HTML-architecture

<section class="gradient">
    <a href="">sample text</a>
    <div class="red"></div>
    <div class="green"></div>
    <div class="blue"></div>
</section>