css - Change Background Color with Angular -

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I know that it should be easy - I'm trying to change the background color of the div based on variables {{ Site.bool}} is going to be right or wrong. 

  
 list 
 list group group item col-md-8 pull-left "ng-repeat =" link in the site list "> gt; & lt; h3 & gt; ; {{Site.name}} & lt; em class = "pull-right" & gt; {{site.url}} & lt; / em> {{site.description}} & lt; product-tab & Gt; & lt; / product-tab & gt; & lt; / h3 & gt; & lt; / div & gt;   
 thanks,   
 
 
 You can assign a class to the div dynamically like this:  
     
 if  trueOrFalseVariable  is correct or false , Then it depends on that 
  The square 
 Then this is a simple matter of setting up the  .cool {}  CSS rules in your stylesheet.  
 You can enter  ng-class  Read all about and you may also want to read about it!   

 




  






























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