title: Apply a filter with CSS to change colors of a picture
body: <p>In this CodePen, a filter is used to turn a blue color into a grey color:</p>
  
  <pre><code>filter: grayscale(100%);
  </code></pre>
  
  <p>How can I change the color to blue/red/green using css filters?</p>
  
  <p><a href="https://codepen.io/wiseoldman/pen/RVRgyB" rel="nofollow noreferrer">https://codepen.io/wiseoldman/pen/RVRgyB</a></p>