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當我把無序列表爲什麼Ul上面的空白區域
body {
margin: 0;
padding: 0;
}
.top-bar {
height: 40px;
width: 100%;
background-color: yellow;
}
#menu {
width: 1020px;
height: : 100%;
margin: 0 auto;
background-color: red;
}
ul {
background-color: red;
width: 100%;
height: 40px;
}
<body>
<div class="top-bar">
<div id="menu">
<ul>
<li>Menu1</li>
</ul>
</div>
</div>
</body>