force margin: 0px to all child elements, is it possible?

Is it possible to force a behavior and ignore css in child DIVs ?

I want to remove all margins that are childs of a top DIV... but only this DIV childs

Btw I need this because I cannot get to the rea开发者_开发百科l CSS i need to inject something that cancels the behaviour (margins) i wanna erase.

<DIV>
   <DIV class="no_margin">
      <DIV class="has_margin"> </DIV> // this one has a margin, and should lose it
   </DIV>
</DIV>
<DIV class="has_margin"> </DIV> // should not lose margin 

You could do any of these:

• .no_margin .has_margin { margin: 0 }
• .no_margin div { margin: 0 }
• .no_margin * { margin: 0 }

And you could add !important if the priority isn't high enough, like margin: 0 !important.

Example http://jsfiddle.net/9yx6B/

use !important

.no_margin *{
    margin:0!important;
}