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HTML Element Style - 如何悬停更改li项边框

我们想知道如何悬停更改li项边框。

<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.mbutton a {
  display: block;
  margin: 0 3px;
  padding: 11px 20px 9px 20px;
  border: 1px solid #fff;
}

.mbutton a:hover {
  border: 1px solid #000;
}

.mbutton .currentnav {
  border: 1px solid #e82c3d;
}
</style>
</head>
<body>
  <ul id="mainmenu">
    <li class="mbutton"><a class="currentnav" href="#">Link 1</a></li>
    <li class="mbutton"><a href="#">Link 2</a></li>
    <li class="mbutton"><a href="#">Link 3</a></li>
  </ul>
</body>
</html>