firefox only css hack | opera only css hack

Below are the firefox only and opera only hacks. Its not recommended to use CSS hacks, but sometimes, we need to write CSS hacks to target specific browsers.

/*firefox only hack*/
@-moz-document url-prefix() { 
  .selector{
	your declaration
  }
}

/*opera only hack*/
    @media not all and (-webkit-min-device-pixel-ratio:0) {  
        .styled-select select{  
           width:100%;
	height:24px;
        }  
    }