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<!DOCTYPE html>
<html>
<style>
div {
  box-sizing: border-box;
  padding: 16px;
  width: 100%;
  background-color: red;
  color: #fff;
  font-size: 30px;
}
.closebtn {
  float: right;
  font-weight: bold;
  cursor: pointer;
}
.closebtn:hover {
  color: #000;
}
</style>
​
<body>
​
<div>
<span onclick="this.parentNode.style.display='none';" class="closebtn">X</span>
<p>click X to close.</p>
</div>
​
</body>
</html>
​