​x
 
<!DOCTYPE html>
<html>
<head>
<style>
.container {
  position: relative;
  width: 100%;
  max-width: 400px;
}
​
.container img {
  width: 100%;
  height: auto;
}
​
.container .btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  background-color: #f1f1f1;
  color: black;
  font-size: 16px;
  padding: 16px 30px;
  border: none;
  cursor: pointer;
  border-radius: 5px;
  text-align: center;
}
​
.container .btn:hover {
  background-color: black;
  color: white;
}
</style>
</head>
<body>
​
<h1>图像上的按钮</h1>
​
<p>为图像添加按钮：</p>
​
<div class="container">
  <img src="img_lights.jpg" alt="Snow" style="width:100%">
  <button class="btn">按钮</button>
</div>
​
</body>
</html>
​