Rainbow castle!

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The published website can be seen at http://gitcases.github.io/rainbowcastle.
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The castle

<style type="text/css"> .roof { border: 100px solid transparent; width: 200px; border-top: none; border-bottom-color: red; box-sizing: border-box; } .ground-floor { background: grey; height: 200px; width: 200px; position: relative; } .ground-floor > .door { background: white; position: absolute; bottom: 0; right: 50px; left: 100px; top: 100px; } </style>

<script>alert("Welcome to the rainbow castle");</script>