CSS Horizontal Menu positioned left losing its background color due to float property

Can you explain why the background color of the ul element disappears when its child elements are floated?

I have a vague memory of reading something about floats causing this issue, but I can't recall the details.

(JSFiddle)

ul {
  padding-left: 0;
  background-color: #036;
}
ul li {
  float: left;
}
<div id="nav">
  <ul>
    <li class="active"><a href="#">Home</a></li>
    <li><a href="#">Services</a></li>
    <li><a href="#">About Us</a></li>
    <li><a href="#">Contact Us</a></li>
  </ul>
</div>

htmlcss

Answer №1

The background color is currently hidden behind the li tags. To reveal it, you can specify a height for the ul element in your CSS code.

ul {
  padding-left: 0;
  background-color: #036;
  height: 40px;
}
ul li {
  float: left;
}

To address this issue properly, you can apply a clearfix class to the UL tag and use the following CSS:

.clearfix {
    content: "";
    display: inline-block;
    clear: both;
}

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