CSS Tip

Add a gradient overlay using border-image

Do you want to add a gradient overlay above your background but you cannot edit the background property, add an extra element or use pseudo-element?

You can do it with border-image!

Only one line of code and you have your overlay 🤩

A gradient overaly above a background-image

.container {
  border-image:
    linear-gradient(#0003,#000) /* your gradient here */
    50%/50%; /* no need to touch this, we always want 50% of slice 
                                                  and 50% border-width */
}

See the Pen Gradient overlay using border-image by Temani Afif (@t_afif) on CodePen.