Change hr style in HTML page
This question already has an answer here:
 The appearance of <hr> in the browser is based on border styles and not dictated by the color property.  Therefore, try using border-color instead:  
hr {
  border: none;
  border-top: 1px solid whitesmoke;
}<hr>您可以使用:
hr { border: 0px; border-bottom: 1px solid whitesmoke; }<hr/>
hr {border-top: 1px solid whitesmoke;}<hr> 上一篇: 设计<hr />元素
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