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CSS Property Value - 如何border: 1px solid black;

border

【border】

我们想知道如何border: 1px solid black;


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
.my-div {
  border: 1px solid black;
  width: 300px;
  height: 200px;
  text-align: center;
}
</style>
</head>
<body>
  <div class="my-div">
    <img src="http://placehold.it/100x50" />
  </div>
</body>
</html>