CSS Tip

3D trailing shadows for images

Add a 3D trailing shadow to your image with a few lines of code

A 3D trailing shadow for images

img {
  --c: #CBE86B; /* the main color */
  --t: 5px; /* thickness of the outline */
  
  width: 200px; /* the image size */
  aspect-ratio: 1; /* only square images, don't change this */
  border-image: 
    linear-gradient(45deg,
      color-mix(in srgb,var(--c),#000 20%) 50%,
      color-mix(in srgb,var(--c),#000 40%) 0) 
     fill 0//9999px;
  clip-path: 
    polygon(0 100%,0 0,100% 0,
      calc(100% + 9999px) 9999px,
      9999px calc(100% + 9999px));
  outline: var(--t) solid var(--c);
  outline-offset: calc(-1*var(--t));
}

See the Pen 3D trailing shadow for images by Temani Afif (@t_afif) on CodePen.

Related: smashingmagazine.com/2024/01/css-border-image-property/