<section class="example">
  <div class="container">
    <css-doodle>
      :doodle {
        @grid: 10 / 100vmax;
        background: midnightblue;
      }
      @shape: cross;
      background: hsla(
        calc(300 - @index() * 5),
        60%, 70%, @rand(.8)
      );
      transform:
        scale(@rand(.2, 1.2))
        translate(
          @rand(-50%, 50%), @rand(-20%, 20%)
        );
    </css-doodle>    
  </div>
  <div class="sample-content">
    <h1>CSS-Doodle Background</h1>
  </div>
</section>

.example {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.sample-content {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 80%;
  background: rgba(255,255,255,0.85);
  transform: translate3d(-50%, -50%, 0);
  padding: 30px;
  
}

@media (min-width:600px) {
  .sample-content {
    width: 30%;
  }
}

.sample-content h1 {
  margin: 0;
  text-align: center;
}