<!DOCTYPE html>
<style>
  .container {
    width: 400px;
    height: 300px;
    display: flex;
    flex-wrap: wrap;
  }
  .box {
    width: 100px;
    height: 100px;
    margin: 5px;
  }
</style>
<div class=container>
  <div class=box style="background:linear-gradient(green 20px, blue 30px)"></div>
  <div class=box style="background:linear-gradient(green 20px, blue 30px)"></div>
  <div class=box style="background:linear-gradient(green 15px, blue 40px)"></div>
  <div class=box style="background:radial-gradient(green 20px, blue 30px)"></div>
  <div class=box style="background:conic-gradient(from 180deg at 30px, green, blue);"></div>
</div>
