Move Sidebar from Above Content To Below When Responsive [closed]

Depending on which device you want to target, you’ll need to use a media query, you can read more about those here:
CssTrick:

@media only screen and (max-width : 320px) {
    #content { 
      display: flex; 
      /* Optional, if you want the DIVs 100% width: */ 
      flex-direction: column;
    }
    #content > .wooside { order: 1; }
    #content > .nine { order: 2; }
}   

Hope you understand!!