<div class="one">
    <div class="two">
      <div class="three bee see">
      </div>
    </div>
  </div>
html {
    box-sizing: border-box;
  }
  *, *:before, *:after { box-sizing: inherit; }

  div {
    width:100%;
    padding:100px;
  }

  .one {
    background: thistle;
  }

  .two {
    background:mistyrose;
  }

  .three {
    background:coral;
  }

External CSS

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External JavaScript

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