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dabblet.css

#menu ul{list-style:none;}   
  #menu ul li{float:left;width:103px;height:43px;border:5px solid green;}
  #menu ul li #menu1 {border:solid 2px red; height: 100%;box-sizing:border-box;}

dabblet.html

<div id="menu">
	<ul>
      		<li><div id="menu1"><a href="#">1 </a></div></li>
	</ul>
</div>

settings.json

{"view":"split","seethrough":"","prefixfree":"1","page":"all"}