html - CSS background color not appearing -

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my webpage has footer 4 separate footer cols. separated 5px margin on right , left side. have green background. footer (containing element) has red background not appear. validated html , not find problem xhtml markup i'm assuming it's css woe.

fiddle: http://jsfiddle.net/48dk6/

footer css declarations. 

/* footer , descendants */ #footer {   font-size:1.3em;   margin-top:10px;   clear:both;   background-color:red;   }  /* footer col styling/positioning */ .footercol {   background-color:green;   width:180px;   float:left;   margin:10px 5px 10px 5px;   }

add overflow:auto #footer css:

#footer {     font-size:1.3em;     margin-top:10px;     clear:both;     background-color:red;     overflow:auto; }

jsfiddle example

this restore behavior seek, caused children .footercol divs being floated. floating child divs removes them normal flow, parent behaves if there nothing contain.


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