title: How can I define colors as variables in CSS?
body: <p>I’m working on a CSS file that is quite long. I know that the client could ask for changes to the color scheme, and was wondering: is it possible to assign colors to variables, so that I can just change a variable to have the new color applied to all elements that use it?</p>
  
  <p>Please note that I can’t use PHP to dynamically change the CSS file.</p>