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CSS Base

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              <main class="site-content foo" role="main" style="background-color: #777777;">
  <div class="image-holder">
    <svg version="1.1" id="svg-1" class="clip-svg" height="100%" viewBox="0 0 1920 1080" preserveAspectRatio="xMidYMax slice">
      <image width="1920" height="1080" xlink:href="https://bglaz.com/images/fall.jpg" filter="url(#grayscale)"></image>
        <g filter="url(#dropShadow)">
          <g clip-path="url(#clip-triangle)">
            <image id="img-1" class='svg-image' width="1920" height="1080" xlink:href="https://bglaz.com/images/fall.jpg"></image>
          </g>
        </g>
    </svg>
  </div>
</main>

<svg version="1.1" id="svg-defs">
  <defs>
    <filter id="dropShadow">
      <feGaussianBlur in="SourceAlpha" stdDeviation="40" result="blur"/>
      <feOffset in="blur" dx="3" dy="3" result="offsetBlur"/>
      <feFlood flood-color="#000000" flood-opacity="0.3" result="offsetColor"/>
      <feComposite in="offsetColor" in2="offsetBlur" operator="in" result="offsetBlur"/>
      <feMerge>
        <feMergeNode />
        <feMergeNode in="SourceGraphic" />
      </feMerge>
    </filter>
    <filter id="grayscale">
      <feColorMatrix type="saturate" values="0"/>
    </filter>
    <clipPath id="clip-triangle">
      <polygon points="960 1080, 0 0, 1920 0"></polygon>
    </clipPath>
  </defs>
</svg>
            
          
!
            
              .image-holder {
  margin: 0 auto;
  text-align: center;

  @media all and (orientation: portrait) {
    width: 100vw;
    height: auto;
  }

  @media all and (orientation: landscape) {
    height: 100vh;
    width: auto;
  }
}

polygon {
  transform-origin: bottom center;
  transform: scale(2);
}

            
          
!
            
              const applyTransform = function(e) {
  const target = e.target || e.srcElement,
    rect = target.getBoundingClientRect(),
    offsetX = (e.touches ? e.touches[0].clientX : e.clientX) - rect.left,
    offsetY = (e.touches ? e.touches[0].clientY : e.clientY) - rect.top,
    svg = document.querySelector("#svg-1");

  //Get the angle between the cursor and transform origin point
  const angleDeg =
    Math.atan2(offsetY - rect.height, offsetX - rect.width / 2) * 180 / Math.PI;

  const el = document.querySelector("polygon");
  el.style.transform = "scale(2) rotate(" + (angleDeg + 90) + "deg)";
  el.style.webkitTransform = "scale(2) rotate(" + (angleDeg + 90) + "deg)";
  el.style.msTransform = "scale(2) rotate(" + (angleDeg + 90) + "deg)";

  const transform = getComputedStyle(el).getPropertyValue("transform");

  el.setAttribute(
    "transform",
    "translate(960 1080) scale(2 2) translate(-960 -1080) rotate(" +
      (angleDeg + 90) +
      ", 960, 1080)"
  );

  //hack to trigger a redraw necessary in some browsers
  document.querySelector("#img-1").style.clipPath = "none";
  document.querySelector("#img-1").offsetWidth;
  document.querySelector("#img-1").style.clipPath = "url(#clip-triangle)";
};

const imageHolder = document.querySelector(".image-holder");
imageHolder.addEventListener("mousemove", applyTransform);
imageHolder.addEventListener("touchmove", applyTransform);

            
          
!
999px
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