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HTML

              
                <main>

<h1>Stamp vignette hover effect <span>(no JavaScript)</span></h1>

<p>
  Concentrates user focus on the central area.<br>
  Each image has individual values set in the HTML, which works wonderfully in production.
</p>

<section class=imgChange>
  <button value="var(--image0)">Images off</button>
  <button value="var(--image1)">Image 1</button>
  <button value="var(--image2)">Image 2</button>
  <button value="var(--image3)">Image 3</button>
  <button value="url(https://www.tesco.com/food-love-stories/2018/stories/1802-jimmys-steak-for-two/i/bg-stories.jpg)">Image 4</button>
</section>

<section class=stamps>

  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=1>
        <div class=stamp_img-bg1 data-imgBrightness=125%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>
          This stamp uses the most extreme values.
          <br>Darkest vignette (1) with the brightest (125%) hover state.
          <br>In practice, use more subtle values.
        </p>
      </div>
      
    </a>
  </article>


  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=0.75>
        <div class=stamp_img-bg7 data-imgBrightness=120%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>Vignette opacity (0.75) with the brightness (120%)</p>
      </div>

    </a>
  </article>


  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=0.5>
        <div class=stamp_img-bg6 data-imgBrightness=115%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>Vignette opacity (0.5) with the brightness (115%)</p>
      </div>

    </a>
  </article>


  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=0.25>
        <div class=stamp_img-bg5 data-imgBrightness=110%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>Vignette opacity (.25) with the brightness (110%)</p>
      </div>

    </a>
  </article>


  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=0.125>
        <div class=stamp_img-bg5 data-imgBrightness=105%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>Minimal values, try it with Image 3.<br>Vignette opacity (.125) with the brightness (105%).</p>
      </div>

    </a>
  </article>


  <article>
    <a class=stamp_link href>

      <div class=img_container data-vignetteOpacity=0>
        <div class=stamp_img-bg5 data-imgBrightness=100%></div>
      </div>

      <div class=stamp_copy data-matchHeights=copy>
        <p>Without effects</p>
      </div>

    </a>
  </article>

    </a>
  </article>

</section>

<p><a href="https://codepen.io/2kool2/pen/XZZJPP" target=_blank title="[new window]">Stamp vignette generator</a></p>

</main>



[[[https://codepen.io/2kool2/pen/mKeeGM]]]
              
            
!

CSS

              
                body {
  font-family: sans-serif;
  line-height: 1.5;
  text-align: center;
  margin: 1rem 0 2rem;
  padding-bottom: 2rem;
  color: hsl(269,19%,30%);
  background-color: hsla(32,100%,85%,.35);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg width='100%25' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cfilter id='a'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.4'/%3E%3C/filter%3E%3C/defs%3E%3C!-- %3Cpath filter='url(%23a)' opacity='.3' d='M0 0h1200v256H0z'/%3E--%3E%3Crect filter='url(%23a)' opacity='.3' width='100%25' height='100%25'/%3E%3C/svg%3E");
}
h1,h2 {
  font-weight: 100;
  margin: 2rem 1rem 1rem;
}
h1 span {font-size:smaller}
p {margin: 1rem}


/* Grid definitions - 1,2,3,6 */
.stamps {
  --spacing: .75rem;
  --columns: 1;
  padding: 0 var(--spacing);
  display: grid;
  grid-gap: var(--spacing);
  grid-template-columns: var(--columns);
}
@media (min-width: 40em) { /* 640px */
  .stamps {
    --spacing: 1rem;
    --columns: 1fr 1fr;
  }
}
@media (min-width: 60em) { /* 960px */
  .stamps {
    --columns: 1fr 1fr 1fr;
  }
}
@media (min-width: 80em) { /* 1280px */
  .stamps {
/*     --columns: 1fr 1fr 1fr 1fr; */
  }
}
@media (min-width: 120em) { /* 1920px */
  .stamps {
    --columns: 1fr 1fr 1fr 1fr 1fr 1fr;
  }
}



main {
  --image0: none;
  --image1: url(https://websemantics.uk/portfolio/2018/food-love-stories/i/iain/bg-stories.jpg);
  --image2: url(https://websemantics.uk/portfolio/2018/food-love-stories/i/al/bg-stories.jpg);
  --image3: url(https://www.tesco.com/mothers-day/2018/i/gifts/s2.jpg);

  --image: var(--image1);
}
section {
  margin: 1rem 0;
}
button {
  font: inherit;
  margin: 0 0.375rem;
}
button:focus {
  background-color: hsl(269,19%,30%);
  color: #fff;
}


/* Custom version test */
.custImg {
  display: inline-block;
  background-color: #fff;
}
form {
  max-width: 30em;
  margin: 0 auto;
}
label {
  display: flex;
  justify-content: space-between;
  margin: .5rem 0;
  text-align: right;
}
label span {
  width: 12em;
}
input {
  width: calc(100% - 14em);
}


.stamp_img-bgTest {
  display: block;
}

[class^="stamp_link"] {
  color: hsl(269,19%,30%);
  background-color: #fff;
  display: block;
  min-width: 296px;
  max-width: 616px;
  margin: 0 auto;
  text-decoration: none;
  transition: color .3s ease-out;
}

[class^="img_container"] {
  position: relative;
}

[class^="stamp_img-bg"] {
  background-repeat: no-repeat;
  height: 300px;
  background-size: cover;
  background-position: center;
  background-image: var(--image);
}
img[class^="stamp_img-bg"] {
  background-image: none;
}

[class^="stamp_copy"] p {
  padding: .75rem;
  margin: 0;
}

/* Stamp image vignette */
[data-vignetteOpacity] {
  --vignetteInnerRadius: 58%;
  --vignetteOuterRadius: 150%;
}
[data-vignetteOpacity="1"] {--vignetteOpacity: 1;}
[data-vignetteOpacity="0.75"] {--vignetteOpacity: 0.75;}
[data-vignetteOpacity="0.5"] {--vignetteOpacity: 0.5;}
[data-vignetteOpacity="0.25"] {--vignetteOpacity: 0.25;}
[data-vignetteOpacity="0.125"] {--vignetteOpacity: 0.125;}
[data-vignetteOpacity="0"] {--vignetteOpacity: 0;}

[data-vignetteOpacity]::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: var(--vignetteOpacity, .5);
  background-image: radial-gradient(ellipse at center, hsla(0,0%,0%,0) var(--vignetteInnerRadius, 58%), hsla(0,0%,0%,1) var(--vignetteOuterRadius, 150%));
  box-shadow: inset 0 0 1rem 0 hsla(0,0%,0%, calc(var(--vignetteOpacity, .5) / 2));
  transition: opacity .3s ease-out;
}
a:hover [data-vignetteOpacity]::after,
a:focus [data-vignetteOpacity]::after {
  will-change: opacity;
  opacity: 0;
}




/* Stamp image brightness */

[data-imgBrightness="100%"] {--imgBrightness: 100%;}
[data-imgBrightness="105%"] {--imgBrightness: 105%;}
[data-imgBrightness="110%"] {--imgBrightness: 110%;}
[data-imgBrightness="115%"] {--imgBrightness: 115%;}
[data-imgBrightness="120%"] {--imgBrightness: 120%;}
[data-imgBrightness="125%"] {--imgBrightness: 125%;}

[data-imgBrightness] {
  transition: filter .3s ease-out;
}
a:hover [data-imgBrightness],
a:focus [data-imgBrightness] {
  will-change: filter;
  filter: brightness(var(--imgBrightness, 100%));
}
              
            
!

JS

              
                
// Switches the images. Using CSS custom properties
(function () {
  
  "use strict";

  const stamps = document.querySelector(".stamps");

  function setImageVar(e) {
    stamps.style.setProperty("--image", e.target.value);
  }

  const btns = document.querySelectorAll("button");
  for (const btn of btns) {
    btn.addEventListener("click", setImageVar, false);
  }

}());
              
            
!
999px

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