Google remarketing tag - iframe height issue

I've noticed that Google's remarketing code inserts an iframe at the bottom of my page. The problem is that the iframe messes up my layout (it's 13px high and leaves a blank white vertical space at the bottom)

 For solution in my sites i use following css code and it worked

iframe[name='google_conversion_frame'] { 
    height: 0 !important;
    width: 0 !important; 
    line-height: 0 !important; 
    font-size: 0 !important;
    margin-top: -13px;
    float: left;
}