代码示例:(标识:css_buttons_group_border)
<!DOCTYPE html>
<html>
<head>
<style>
.btn-group .button {
  background-color: #4CAF50; /* 绿色 */
  border: 1px solid green;
  color: white;
  padding: 15px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  cursor: pointer;
  float: left;
}

.btn-group .button:not(:last-child) {
  border-right: none; /* 阻止双边框 */
}

.btn-group .button:hover {
  background-color: #3e8e41;
}
</style>
</head>
<body>

<h1>带边框的按钮组</h1>

<p>添加边框,来创建带按钮的按钮组:</p>

<div class="btn-group">
  <button class="button">Button</button>
  <button class="button">Button</button>
  <button class="button">Button</button>
  <button class="button">Button</button>
</div>

<p style="clear:both"><br>请记得之后清除浮动,否则这个 p 元素会向按钮浮动。</p>

</body>
</html>
运行结果: