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HTML

              
                <link href="https://fonts.googleapis.com/css?family=Varela+Round" rel="stylesheet" />

<div class="layer">
  <svg id="wrapper" class="wrapper" xmlns="http://www.w3.org/2000/svg">
    <defs>
      <svg xmlns="http://www.w3.org/2000/svg" class="displacementmap" id="absolute-displacementmap" width="256" height="256" preserveAspectRatio="none" version="1.1" xmlns:xlink="http://www.w3.org/1999/xlink">
        <defs>
          <style type="text/css">
            .red-gradient {
              fill: url(#red-gradient);
            }

            .blue-gradient {
              fill: url(#blue-gradient);
              mix-blend-mode: screen;
            }
          </style>

          <linearGradient id="red-gradient" x1="0" x2="1" y1="0" y2="0" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
            <stop offset="0%" stop-color="#FF0000" />
            <stop offset="1" stop-color="#FF0000" stop-opacity="0" />
          </linearGradient>
          <linearGradient id="blue-gradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
            <stop offset="0%" stop-color="#0000FF" />
            <stop offset="1" stop-color="#0000FF" stop-opacity="0" />
          </linearGradient>
        </defs>
        <rect width="100%" height="100%" x="0" y="0" fill="black" />
        <rect id="red-gradient-rect" width="100%" height="100%" x="0" y="0" class="red-gradient" />
        <rect id="blue-gradient-rect" width="100%" height="100%" x="0" y="0" class="blue-gradient" />
      </svg>
      <svg xmlns="http://www.w3.org/2000/svg" id="radial-waves-fragment" class="waves" width="480" height="480" preserveAspectRatio="none">
        <defs>
          <radialGradient id="radial-wave-gradient" cx="50%" cy="50%" r="50%" fx="50%" fy="50%">
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:0" />
            <stop offset="0%" style="stop-color:rgb(128,0,128); stop-opacity:1" />
            <stop offset="100%" style="stop-color:rgb(128,0,128);stop-opacity:1" />
          </radialGradient>
        </defs>
        <rect id="rect" x="-20%" y="-20%" width="140%" height="140%" fill="url(#radial-wave-gradient)" />
      </svg>
      <filter id="dm-filter" x="0" y="0%" width="100%" height="100%" color-interpolation-filters="sRGB" preserveAspectRatio="none">

        <!-- Feimage referencing an absolute map -->
        <feImage id="absoluteMap" x="0" y="0" width="100%" height="100%" result="ABSOLUTEMAP" href="#absolute-displacementmap" />

        <!-- A second feImage that defaults to a URL encoded neutral map. Here we will reference an SVG containing a radial gradient for the waves. Animation will then be achieved with javascript, updating the href of the feimage on each interval -->
        <feImage id="radial-waves-feimage" x="0" y="0" width="100%" height="100%" result="WAVES" href="data:image/svg+xml;charset=utf-8,%3Csvg%20id%3D%22displacementmap%22%20width%3D%22256%22%20height%3D%22256%22%20preserveAspectRatio%3D%22none%22%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Crect%20id%3D%22rect%22%20x%3D%22-20%25%22%20y%3D%22-20%25%22%20width%3D%22140%25%22%20height%3D%22140%25%22%20fill%3D%22rgb%28128%2C0%2C128%29%22%2F%3E%3C%2Fsvg%3E" />

        <!-- Merging absolutemap and animation -->
        <feMerge result="MERGE_IMG">
          <feMergeNode in="ABSOLUTEMAP" />
          <feMergeNode in="WAVES" />
        </feMerge>

        <!-- Using the merged result as input for our displacement map  -->
        <feDisplacementMap in="SourceGraphic" in2="MERGE_IMG" scale="80" xChannelSelector="R" yChannelSelector="B" />
      </filter>
    </defs>
    <g id="content" class="content">
      <rect width="480" height="480" fill="black" fill-opacity="0" />
      <image x="40" y="40" width="400px" height="400px" preserveAspectRatio="xMidYMid" href="https://assets.codepen.io/100347/fedm_pattern-a.svg" />
      <svg aria-label="Button for opening a Layer" role="button" id="klikbut" class="klikbut" x="200" y="200" width="80px" height="80px" style="overflow: visible">
        <desc>Click to open modal</desc>
        <rect class="klikbut__bg" width="80px" height="80px" />
        <text class="klikbut__text" x="7" y="53">cliq</text>
      </svg>
      <g id="modal" aria-label="Button for closing this Layer" role="dialog" class="modal">
        <rect class="modal__bg" width="360" height="360" x="60" y="60" />
        <text class="modal__text" text-anchor="middle" width="360" height="360" x="60" y="200">
          <tspan x="240">That</tspan>
          <tspan x="240" dy="1.1em">was one</tspan>
          <tspan x="240" dy="1.1em">hell of a</tspan>
          <tspan x="240" dy="1.1em">ripple!</tspan>
        </text>
        <svg role="button" id="closebut" class="closebut" x="220" y="100" width="40px" height="40px" style="overflow: visible">
          <desc>Click to close modal</desc>
          <text class="closebut__text" text-anchor="right" width="360" height="360" x="-44" y="24">close</text>
          <rect class="closebut__bg" width="40px" height="40px" />
          <line x1="10" y1="10" x2="30" y2="30" style="stroke:white;stroke-width:3;stroke-linecap: round;" />
          <line x1="30" y1="10" x2="10" y2="30" style="stroke:white;stroke-width:3;stroke-linecap: round;" />
        </svg>
      </g>
    </g>
  </svg>
</div>
              
            
!

CSS

              
                @use postcss-preset-env;

:root {
    --bgCol: #424a5e;
    --btnTxt: white;
    --btnTxt--hover: #9f6dd8;
    --modalBgCol: rgba(232, 224, 235, 0.8);
    --modalTxt: #697277;
    --btnCloseBgCol: #4b5969;
    --btnCloseBgCol--hover: #d9a7f2;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    height: 100%;
}

.filter {
    position: absolute;
    top: 0;
    left: -1;
    width: 1px;
    height: 1px;
    visibility: hidden;
}

body {
    margin: 0;
    padding: 1.25em;
    height: 100%;
    color: white;
    font: 0.85em -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    min-width: 320px;
    display: flex;
    justify-content: center;
    background: var(--bgCol);
    font-family: 'Varela Round', sans-serif;
}

::selection {
    background: var(--bgCol);
}
.waves {
    pointer-events: none;
}

.klikbut {
    overflow: hidden;
    cursor: pointer;
}

.klikbut__text {
    font-size: 40px;
    fill: var(--btnTxt);
    pointer-events: none;
    transition: fill 0.3s;

    @nest .klikbut:hover & {
        fill: var(--btnTxt--hover);
    }
}

.klikbut__bg {
    fill: var(--btnTxt--hover);
    cursor: pointer;
    transition: fill 0.2s, transform 0.2s cubic-bezier(0.005, 0.625, 0.37, 1.65) 0.2s;
    transform: scale(1);

    @nest .klikbut:hover & {
        fill: var(--btnTxt);
        transform: translate(-20px, -20px) scale(1.5);
    }
}

.layer {
    position: relative;
    display: flex;
    justify-content: stretch;
    margin: auto;
    width: 480px;
    height: 480px;
}

.modal {
    display: none;
    will-change: display, opacity, transform;
}

.content {
    will-change: filter;
    filter: url(#dm-filter);
}

.modal--active {
    display: block;
    pointer-events: auto;
    animation: modalin 1s ease-out forwards;
}

.modal--inactive {
    display: block;
    pointer-events: none;
    animation: modalout 0.8s 0.4s ease-out forwards;
}

.modal__bg {
    fill: var(--modalBgCol);
}

.modal__text {
    fill: var(--modalTxt);
    font-size: 46px;
}

.closebut {
    cursor: pointer;
}

.closebut__bg {
    fill: var(--btnCloseBgCol);
    transition: fill 0.3s;

    @nest .closebut:hover & {
        fill: var(--btnCloseBgCol--hover);
    }
}

.wrapper {
    display: block;
    position: relative;
    top: 0;
    left: 0;
    width: 480px;
    height: 480px;
}

@keyframes modalin {
    from {
        opacity: 0;
        transform: translate(40%, 40%) scale(0.2);
    }

    to {
        opacity: 1;
        transform: translate(0) scale(1);
    }
}

@keyframes modalout {
    from {
        transform: translate(0) scale(1);
        opacity: 1;
    }

    99% {
        transform: translate(-25%, -25%) scale(1.5);
        opacity: 0;
        display: block;
    }

    100% {
        opacity: 0;
        transform: translate(-1000px, 0) scale(1);
        display: none;
    }
}

@keyframes trigger {
    from {
        opacity: 1;
    }

    50% {
        opacity: 0.1;
    }

    to {
        opacity: 1;
    }
}

              
            
!

JS

              
                const modal = document.getElementById("modal");
const klikbut = document.getElementById("klikbut");
const closebut = document.getElementById("closebut");
const modalEvt = new CustomEvent("triggerModal");

const setupMap = () => {
  const feImage = document.querySelector("#absoluteMap");
  const absMapUrl = feImage.getAttribute("href");
  const absMap = document.querySelector(absMapUrl);

  feImage.setAttribute(
    "href",
    `data:image/svg+xml;charset=utf-8,${encodeURIComponent(absMap.outerHTML)}`
  );
};

const fadeIn = () => {
  modal.classList.remove("modal--inactive");
  modal.classList.add("modal--active");
  klikbut.removeEventListener("click", fadeIn);
  closebut.addEventListener("click", fadeOut);
  document.body.dispatchEvent(modalEvt);
};

const fadeOut = () => {
  modal.classList.remove("modal--active");
  modal.classList.add("modal--inactive");
  closebut.removeEventListener("click", fadeOut);
  klikbut.addEventListener("click", fadeIn);
  document.body.dispatchEvent(modalEvt);
};

function initUI() {
  klikbut.addEventListener("click", fadeIn);
}

setupMap();

testSVGFragmentToFeImg().then((fragmentInFeImageSupported) => {
  const animDur = 1350;
  const ripplFragment = document.getElementById("radial-waves-fragment");
  const ripplFeImg = document.getElementById("radial-waves-feimage");
  const numOfStops = ripplFragment.querySelectorAll('[offset="0%"]').length;
  const timelineOffsetDelta = Math.floor(animDur / numOfStops);
  const animeTimelineConf = {
    duration: animDur,
    autoplay: false,
    easing: "easeOutQuad",
    round: 10
  };

  let timelineOffset = 0;
  let animeTimeline;

  if (!fragmentInFeImageSupported) {
    const animeTgt = {};
    const uriArr = encodeURIComponent(
      ripplFragment.outerHTML.replace(/offset="0%"/g, 'offset="~"')
    ).split("~");

    animeTimelineConf.update = () => {
      let hrefVal = "data:image/svg+xml;charset=utf-8,";

      for (let i = 0; i < numOfStops; i++) {
        hrefVal += `${uriArr[i]}${animeTgt[`offset_${numOfStops - i - 1}`]}`;
      }

      hrefVal += `${uriArr[uriArr.length - 1]}`;
      ripplFeImg.setAttribute("href", hrefVal);
    };

    animeTimeline = anime.timeline(animeTimelineConf);

    for (let i = 0; i < numOfStops; i++) {
      const id = `offset_${i}`;
      animeTgt[id] = "0%";

      const conf = {
        targets: animeTgt,
        [id]: "100%"
      };

      animeTimeline.add(conf, timelineOffset);
      timelineOffset += timelineOffsetDelta;
    }
  } else {
    adjustSafariScreenDensity(ripplFragment);
    animeTimeline = anime.timeline(animeTimelineConf);

    for (let i = 0; i < numOfStops; i++) {
      const className = `offset_${i}`;
      const el = ripplFragment.querySelector(
        `[offset="0%"]:nth-of-type(${numOfStops - i})`
      );
      el.classList.add(className);

      const conf = {
        targets: `.${className}`,
        offset: "99%"
      };

      animeTimeline.add(conf, timelineOffset);
      timelineOffset += timelineOffsetDelta;
    }

    ripplFeImg.setAttribute("href", "#radial-waves-fragment");
  }

  document.body.addEventListener("triggerModal", animeTimeline.restart);

  initUI();
});

              
            
!
999px

Console