how to hide a warming w3c using css code code example

Example 1: css visibility

{ visibility: hidden; }   
{ visibility: visible; }  
{ visibility: collapse; }

Example 2: hide a div

<div id="main"> 
  <p> Hide/show this div </p>
</div>

('#main').hide(); //to hide

// 2nd way, by injecting css using jquery
$("#main").css("display", "none");