title: How do websites get this almost white color?
body: <p>The background of a lot of websites is not actually white: it's more of a greyish color:</p>
  
  <p><img src="https://i.stack.imgur.com/vqoRO.png" alt="enter image description here"></p>
  
  <p>How do they do this? Is it just a picture they made or is there some CSS?</p>