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HTML

            
              <main id=app>

  <h1>Pokemon Card, Holo Effect</h1>
  <p>I've had to disable animation effect, as it seems there's a bug in Chromium with animations and mix-blend-mode rendering conflicts</p>

  <div class="card">
  </div>
  <span class="operator">+</span>
  <div class="card">
    <span>+ color-dodge</span>
  </div>
  <span class="operator">+</span>
  <div class="card">
    <span>+ color-dodge</span>
  </div>
  <span class="operator">=</span>
  <div class="card"></div>

  <style class="hover"></style>

</main>
            
          
!

CSS

            
              .card {
  width: 320px;
  height: 452px;
  background-color: #211799;
  background-image: url(https://images.pokemontcg.io/xy2/12_hires.png);
  background-size: 100%;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: 8px;
  box-shadow: -3px -3px 3px 0 rgba(#26e6f7, 0.6), 3px 3px 3px 0 rgba(#f759e4, 0.6), 0 0 6px 2px rgba(#ffe759, 0.6),
    0 35px 25px -15px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
  display: inline-block;
  vertical-align: middle;
  margin: 20px 10px;
}

.card > span {
  position: relative;
  top: 45%;
}

.card:before,
.card:after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background-image: linear-gradient(
    115deg,
    transparent 0%,
    rgb(0, 231, 255) 30%,
    rgb(255, 0, 231) 70%,
    transparent 100%
  );
  background-position: 0% 0%;
  background-repeat: no-repeat;
  background-size: 300% 300%;
  mix-blend-mode: color-dodge;
  opacity: 0.2;
  z-index: 1;
  // animation: holoGradient 15s ease infinite;
}
.card:after {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/13471/sparkles.gif");
  background-position: center;
  background-size: 180%;
  mix-blend-mode: color-dodge;
  opacity: 1;
  z-index: 2;
  // animation: holoSparkle 20s ease infinite;
}

.card.active:before {
  opacity: 1;
  animation: none;
  transition: none;
  background-image: linear-gradient(
    115deg,
    transparent 0%,
    transparent 25%,
    rgba(0, 231, 255,0.7) 45%,
    rgba(255, 0, 231,0.7) 55%,
    transparent 70%,
    transparent 100%
  );
}
.card:nth-of-type(1),
.card:nth-of-type(2),
.card:nth-of-type(3) {
  width: 160px;
  height: 226px;
  box-shadow: 0 0 1px 1px rgba(white,0.4), 0 25px 15px -10px rgba(0, 0, 0, 0.5);
}

.card:nth-of-type(1),
.card:nth-of-type(2),
.card:nth-of-type(3) {
  &:before, &:after {
    animation: none;
    opacity: 1;
  } 
}
.card:nth-of-type(1) {
  &:before, &:after { display: none; }
}
.card:nth-of-type(2) {
  background: none;
  &:before { display: none; }
}
.card:nth-of-type(3) {
  background: none;
  &:before { background-position: center; }
  &:after { display: none; }
}

.operator {
  display: inline-block;
  vertical-align: middle;
  font-size: 45px;
}
@keyframes holoSparkle {
  0% {
    opacity: 0;
  }
  12% {
    opacity: 1;
  }
  70% {
    opacity: 0.5;
  }
  95% {
    opacity: 0.2;
  }
}

@keyframes holoGradient {
  3% {
    opacity: 0;
  }
  5% {
    background-position: 0% 0%;
  }
  7% {
    opacity: 0.5;
  }
  9% {
    background-position: 100% 100%;
  }
  11% {
    opacity: 0;
  }
  50% {
    opacity: 0;
    background-position: 100% 100%;
  }
  55% {
    opacity: 0.3;
  }
  70% {
    opacity: 0;
    background-position: 0% 0%;
  }
}

body {
  color: white;
  background: #333844;
  font-family: "Heebo", sans-serif;
  display: flex;
  justify-content: center;
  vertical-align: middle;
  height: 100%;
  text-align: center;
}
html {
  height: 100%;
}

h1 {
  display: block;
  margin-top: 30px;
  margin-bottom: 5px;
}

p {
  margin-top: 5px;
  font-weight: 200;
}
            
          
!

JS

            
              /*

  using 
    - an animated gif of sparkles.
    - an animated gradient as a holo effect.
    - color-dodge blend mode

  this could be enhanced with some 3d effects
  which change the background positions
  
*/

var $cards = $(".card");
var $style = $(".hover");
$cards.on("mousemove", function(e) {
  var $card = $(this);
  var l = e.offsetX;
  var t = e.offsetY;
  var h = $card.height();
  var w = $card.width();
  var lp = Math.abs(Math.floor(100 / w * l)-100);
  var tp = Math.abs(Math.floor(100 / h * t)-100);
  var bg = `background-position: ${lp}% ${tp}%;`
  var style = `.card.active:before { ${bg} }`
  $cards.removeClass("active");
  $card.addClass("active");
  $style.html(style);
}).on("mouseout", function() {
  $cards.removeClass("active");
});
            
          
!
999px

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