when I class a div and assign css to that class it doest do anything : Sorry, i'm relatively new to programming. My question is, is that I have the div classed as .logo, so when i go over to my css file, I want to assign some different dimensions to the gif, as you can see in the css snippet, but the thing is that it just doesn't work...

    <div class="logo">
          <img src="giphy.gif">
        </div>

    .logo {
      width: 333px;
      height: 396px;
    }

