Fancy frame for your image with hover effect

Add a nice frame around your image with a cool hover effect

• No extra element (only the <img> tag)
• No pseudo-elements
• Only 4 gradients
• Optimized with CSS variables

@property --s {
  syntax: "<length>";
  initial-value: 0px;
  inherits: true;
}

img {
  --t: 3px;  /* control the thickness (corner = 3*edge) */
  --s: 40px; /* control the size of the corners (that also affect the size of the edges) */
  --g: 8px;  /* control the gap */
  --c: #755C3B;
  
  padding: calc(2*var(--t) + var(--g));
  border: var(--t) solid #0000;
  background:
    conic-gradient(at var(--s) calc(3*var(--t)),#0000 75%,var(--c) 0)
     0 0/calc(100% - var(--s)) calc(100% - 3*var(--t)) border-box,
    conic-gradient(at calc(3*var(--t)) var(--s),#0000 75%,var(--c) 0)
     0 0/calc(100% - 3*var(--t)) calc(100% - var(--s)) border-box,
    linear-gradient(  0deg,var(--c) calc(2*var(--t)),#0000 0) 
      50% var(--t)/calc(100% - 2*(var(--s) + var(--g))) 100% 
      repeat-y padding-box,
    linear-gradient(-90deg,var(--c) calc(2*var(--t)),#0000 0) 
      var(--t) 50%/100% calc(100% - 2*(var(--s) + var(--g))) 
      repeat-x padding-box;
  transition: --s .5s;
}
img:hover {
   --s: 80px;
}

See the Pen Fancy image frame with hover effect by Temani Afif (@t_afif) on CodePen.

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