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HTML

CSS

CSS Base

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JavaScript

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HTML

              
                  <body>
  <ul class="menu-main"><!--
    1つめのタブ
    --><li class="manu-head"><a href="">Tab 01</a>
          <div class="menu-content">
            <ul>
              <li><a href="">Tab 01 01</a></li>
              <li><a href="">Tab 01 02</a></li>
              <li><a href="">Tab 01 03</a></li>
              <li><a href="">Tab 01 04</a></li>
              <li><a href="">Tab 01 05</a></li>
            </ul>
          </div><!--
      --></li><!--
      2つめのタブ
      --><li class="manu-head"><a href="">Tab 02</a>
          <div class="menu-content">
            <ul>
              <li><a href="">Tab 02 01</a></li>
              <li><a href="">Tab 02 02</a></li>
              <li><a href="">Tab 02 03</a></li>
              <li><a href="">Tab 02 04</a></li>
              <li><a href="">Tab 02 05</a></li>
            </ul>
          </div><!--
      --></li><!--
      3つめのタブ
      --><li class="manu-head"><a href="">Tab 03</a>
          <div class="menu-content">
            <ul>
              <li><a href="">Tab 03 01</a></li>
              <li><a href="">Tab 03 02</a></li>
              <li><a href="">Tab 03 03</a></li>
              <li><a href="">Tab 03 04</a></li>
              <li><a href="">Tab 03 05</a></li>
            </ul>
          </div><!--
      --></li>
    </ul>
</body>
              
            
!

CSS

              
                body{
  background-color: green;
  margin:0;
  width:100%;
}
.menu-main {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
  text-align: center;
}
.manu-head {
  display: inline-block;
  width: 33.33%;
}
.manu-head a{
  color: white;
  text-decoration: none;
}
.manu-head:hover {
  background: red;
}
.menu-content {
  color: white;
  position: absolute;
  left: 0;
  background: gray;
  width: 100%;
  color: white;
  /*最初はnone*/
  display: none;
}
.manu-head:hover .menu-content {
  /*hoverされたらblock*/
  display: block;
}
.menu-content li {
  display: block;
}
              
            
!

JS

              
                
              
            
!
999px

Console