[css] how to make a div to wrap two float divs inside?

Float everything.

If you have a floated div inside a non-floated div, everything gets all screwy. That's why most CSS frameworks like Blueprint and 960.gs all use floated containers and divs.

To answer your particular question,

<div class="container">
<!--
.container {
  float: left;
  width: 100%;
}
-->
  <div class="sidebar">
  <!--
  .sidebar {
    float: left;
    width: 20%;
    height: auto;
  }
  -->
  </div>
  <div class="content">
  <!--
  .sidebar {
    float: left;
    width: 20%;
    height: auto;
  }
  -->
  </div>
</div>

should work just fine, as long as you float:left; all of your <div>s.

Examples related to css

need to add a class to an element Using Lato fonts in my css (@font-face) Please help me convert this script to a simple image slider Why there is this "clear" class before footer? How to set width of mat-table column in angular? Center content vertically on Vuetify bootstrap 4 file input doesn't show the file name Bootstrap 4: responsive sidebar menu to top navbar Stylesheet not loaded because of MIME-type Force flex item to span full row width

Examples related to layout

This view is not constrained What's the difference between align-content and align-items? CSS Flex Box Layout: full-width row and columns Fill remaining vertical space with CSS using display:flex What is setContentView(R.layout.main)? How to change line color in EditText Scrolling a flexbox with overflowing content UICollectionView - Horizontal scroll, horizontal layout? How to style a div to be a responsive square? 100% width Twitter Bootstrap 3 template

Examples related to html

Embed ruby within URL : Middleman Blog Please help me convert this script to a simple image slider Generating a list of pages (not posts) without the index file Why there is this "clear" class before footer? Is it possible to change the content HTML5 alert messages? Getting all files in directory with ajax DevTools failed to load SourceMap: Could not load content for chrome-extension How to set width of mat-table column in angular? How to open a link in new tab using angular? ERROR Error: Uncaught (in promise), Cannot match any routes. URL Segment

Examples related to css-float

Bootstrap - floating navbar button right Bootstrap change div order with pull-right, pull-left on 3 columns Bootstrap 3 Multi-column within a single ul not floating properly CSS float right not working correctly Floating Div Over An Image CSS force new line Why doesn't the height of a container element increase if it contains floated elements? Advantages of using display:inline-block vs float:left in CSS Floating divs in Bootstrap layout What does the CSS rule "clear: both" do?