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CSS

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HTML 

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

<section>
  <div id="progress" class="progress-indicator" aria-labelledby="progress-valuenow" role="progressbar" aria-valuemin="0%" aria-valuenow="0%" aria-valuemax="100%">
    <div class="progress-label">
      <p id="progress-valuenow" class="progress-label__value">
        <span class="hidden">Progress </span>0%<span class="hidden"> completed.</span>
      </p>
    </div>
    <svg class="progress-indicator__bar" xmlns="http://www.w3.org/2000/svg" width="400" height="150" aria-role="presentation">
      <defs>
        <filter id="blur-filter-1" color-interpolation-filters="sRGB">
          <feGaussianBlur stdDeviation="8" />
        </filter>
        <filter id="blur-filter-2" color-interpolation-filters="sRGB">
          <feGaussianBlur stdDeviation="3" />
        </filter>
        <filter id="blur-filter-3" color-interpolation-filters="sRGB">
          <feGaussianBlur stdDeviation="1" />
        </filter>
        <filter id="dm-filter" x="0" y="0" width="440" height="150" color-interpolation-filters="sRGB" preserveAspectRatio="none" filterUnits="userSpaceOnUse">
          <feFlood flood-color="transparent" result="FLOOD_TRANS" />
          <feImage id="feimage" href="" width="100%" height="750" x="0" y="-600" result="FEIMG_MAP" preserveAspectRatio="none">

          </feImage>
          <feGaussianBlur id="gaussianblur" in="SourceGraphic" stdDeviation="4" result="BLUR_SOURCE" />

          <feFlood id="floodNeutral" flood-color="rgba(128, 0, 128)" result="FLOOD_NEUTRAL" width="1%" x="0%">
          </feFlood>
          <feMerge result="MERGE_FLOOD">
            <feMergeNode in="FLOOD_TRANS" />
            <feMergeNode in="FLOOD_NEUTRAL" />
          </feMerge>
          <feGaussianBlur in="MERGE_FLOOD" stdDeviation="10" result="BLUR_FLOOD" />
          <feMerge result="MERGE_ALL">
            <feMergeNode in="FEIMG_MAP" />
            <feMergeNode in="BLUR_FLOOD" />
          </feMerge>
          <feDisplacementMap id="displSource" in="BLUR_SOURCE" RESULT="DISPL_SOURCE" in2="MERGE_ALL" scale="0" xChannelSelector="R" yChannelSelector="B">
          </feDisplacementMap>

          <feFlood id="floodMask10" flood-color="black" result="FLOOD_MASK_10" width="440">
          </feFlood>
          <feMerge result="MERGE_MASK">
            <feMergeNode in="FLOOD_TRANS" />
            <feMergeNode in="FLOOD_MASK_10" />
          </feMerge>
          <feGaussianBlur in="MERGE_MASK" stdDeviation="20" result="BLUR_MASK" />
          <feComposite in="SourceGraphic" in2="BLUR_MASK" in="BLUR_10" operator="in" result="COMP_SOURCE" />

          <feFlood id="floodMask20" flood-color="black" result="FLOOD_MASK_20" x="0">

          </feFlood>
          <feMerge result="MERGE_DM">
            <feMergeNode in="FLOOD_TRANS" />
            <feMergeNode in="FLOOD_MASK_20" />
          </feMerge>
          <feGaussianBlur in="MERGE_DM" stdDeviation="20" result="BLUR_MASK_20" />
          <feComposite in="DISPL_SOURCE" in2="BLUR_MASK_20" in="BLUR_MASK_20" operator="in" result="COMP_MAP" />

          <feMerge result="MERGE_DM">
            <feMergeNode in="COMP_SOURCE" />
            <feMergeNode in="COMP_MAP" />
          </feMerge>
          <!-- 
            <feMerge>
                <feMergeNode in="BLUR_MASK"/>
                <feMergeNode in="BLUR_MASK_20" />
            </feMerge>  -->
        </filter>
        <g id="animations">
          <animate class="js_syncStart" href="#floodNeutral" attributeName="width" values="7%;120%;" dur="15s" repeatCount="1" begin="indefinite" end="indefinite" />
          <animate class="js_syncStart" href="#feimage" id="feImgAnim" attributeName="y" trom="-550" to="0" dur="12s" repeatCount="100" begin="indefinite" end="indefinite" restart="always" fill="remove" />
          <animate class="js_syncStart" href="#displSource" id="displAnim" attributeName="scale" values="0; 210; 60; 60" keySplines="
                0.61, 1, 0.88, 1;
                0.61, 1, 0.88, 1;
                0.61, 1, 0.88, 1" keyTimes="
                0;0.025;0.05; 1" calcMode="spline" dur="12s" repeatCount="1" begin="indefinite" end="indefinite" fill="remove" />
          <animate class="js_syncStart" href="#floodMask10" attributeName="width" values="40;440" dur="13s" repeatCount="1" begin="indefinite" end="indefinite" />
          <animate class="js_syncStart" href="#floodMask20" attributeName="x" values="10;440" dur="13s" repeatCount="1" begin="indefinite" end="indefinite" />
          <animate class="js_syncStart" href="#stripePtrn" begin="indefinite" end="indefinite" attributeName="x" from="-400" to="0" dur="13s" repeatCount="1" />
          <animate class="js_syncStart" href="#stripePtrn" begin="indefinite" attributeName="opacity" values="1; 1; 0" keyTimes="0; 0.9; 1" dur="12s" fill="freeze" repeatCount="1" />
          <animate class="js_syncStart" href="#barLine" id="barAnimMove" begin="indefinite" end="indefinite" attributeName="x1" values="40;340" dur="10s" repeatCount="1" />
          <animate class="js_syncStart" href="#barLine" id="barAnimOut" begin="indefinite" attributeName="stroke" values="hsla(70, 100%, 46%, 0); hsl(70, 100%, 46%); hsl(70, 100%, 46%); hsla(70, 100%, 46%, 0)" keyTimes="0; 0.1; 0.98; 1" dur="10s" repeatCount="1" />
        </g>
        <linearGradient id="bargradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
          <stop offset="0.1" stop-color="hsl(120, 100%, 50%)" />
          <stop offset="0.3" stop-color="hsl(84, 100%, 76%)" />
          <stop offset="0.5" stop-color="hsl(84, 100%, 50%)" />
          <stop offset="0.75" stop-color="hsl(120, 100%, 40%)" />
          <stop offset="1" stop-color="hsl(120, 100%, 50%)" />
        </linearGradient>
        <linearGradient id="stripegradient" x1="0" x2="0" y1="0" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
          <stop offset="0.1" stop-color="hsl(50, 100%, 50%)" />
          <stop offset="0.3" stop-color="hsl(50, 100%, 82%)" />
          <stop offset="0.5" stop-color="hsl(50, 100%, 50%)" />
          <stop offset="0.75" stop-color="hsl(50, 100%, 40%)" />
          <stop offset="1" stop-color="hsl(50, 100%, 45%)" />
        </linearGradient>
        <clipPath id="myClip">
          <rect x="40" y="61" width="360" height="28" rx="14" />
        </clipPath>
        <pattern id="stripes" viewBox="0,0,54,28" width="9%" height="100%" preserveAspectRatio="none">
          <rect x="0" y="0" width="25" height="28" fill="url(#stripegradient)" transform="skewX(45)" />
        </pattern>
      </defs>
      <g id="target" class="progress-indicator__filtertarget">
        <g class="progress-indicator__dropshadow" filter="url(#blur-filter-1)">
          <rect width="440" height="150" fill="transparent" />
          <line class="progress-indicator__shadow" x1="30" y1="66%" x2="410" y2="66%" stroke-linecap="round" />
        </g>

        <g class="progress-indicator__pill">
          <rect x="40" y="61" width="360" height="28" fill="url(#bargradient)" rx="14" />
          <g clip-path="url(#myClip)">
            <rect id="stripePtrn" x="-400" y="61" width="440" height="28" fill="url(#stripes)">
            </rect>
            <rect filter="url(#blur-filter-2)" x="40" y="61" width="360" height="28" fill="transparent" rx="14" stroke="hsl(120, 100%, 25%)" stroke-width="4" />
          </g>
          <g filter="url(#blur-filter-3)" opacity="0.7">
            <rect width="100%" height="100%" fill="transparent" />
            <line x1="55" y1="70" x2="58" y2="70" stroke="white" stroke-width="4" stroke-linecap="round" />
            <line x1="65" y1="70" x2="385" y2="70" stroke="white" stroke-width="4" stroke-linecap="round" />
          </g>
          <line id="barLine" x1="400" y1="66" x2="340" y2="66" stroke="transparent" stroke-width="3" stroke-linecap="round" />

        </g>
      </g>
    </svg>
  </div>
  <button id="btn-download" class="download-btn" style="overflow: visible;" aria-label="start download">
    <svg width="100%" height="100" viewBox="0 0 70 70" preserveAspectRatio="xMidYMin" style="overflow: visible;">
      <defs>
        <linearGradient id="bg" x1="0" x2="0" y1="-1" y2="1" color-interpolation="sRGB" gradientUnits="objectBoundingBox">
          <animate id="gradientHoverAnimIn" begin="indefinite" attributeName="y2" values="1; 2" dur="0.4s" fill="freeze" repeatCount="1" />
          <animate id="gradientHoverAnimOut" fill="freeze" begin="indefinite" attributeName="y2" values="2; 1" dur="0.8s" repeatCount="1" fill="freeze" />
          <stop offset="0" stop-color="hsl(120, 100%, 36%)" />
          <stop offset="0.33" stop-color="hsl(120, 100%, 50%)" />
          <stop offset="0.66" stop-color="hsl(120, 100%, 36%)" />
          <stop offset="1" stop-color="hsl(120, 100%, 50%)" />
        </linearGradient>
        <symbol id="arrow" class="download-arrow-icon">
          <circle cx="50%" cy="50%" r="33" fill="none" stroke="white" />
          <line x1="35.5" y1="17" x2="35.5" y2="52" stroke="white">
            <animate id="arrowHoverAnimIn" begin="indefinite" attributeName="y2" values="52; 42" dur="0.3s" repeatCount="1" fill="freeze" />
            <animate begin="arrowHoverAnimIn.begin" attributeName="y1" values="17; 42" dur="0.3s" repeatCount="1" fill="freeze" />
            <animate id="arrowHoverAnimOut" begin="indefinite" attributeName="y2" values="42; 54" dur="0.3s" repeatCount="1" fill="freeze" />
            <animate begin="arrowHoverAnimOut.begin" attributeName="y1" values="42; 17" dur="0.3s" repeatCount="1" fill="freeze" />
          </line>

          <polyline points="14,39 35.5,54 55,39" stroke="white" fill="none">
            <animateTransform begin="arrowHoverAnimIn.begin" attributeName="transform" attributeType="XML" type="translate" from="0 0" to="0 -10" dur="0.3s" repeatCount="1" fill="freeze" />
            <animateTransform begin="arrowHoverAnimOut.begin" attributeName="transform" attributeType="XML" type="translate" from="0 -10" to="0 0" dur="0.3s" repeatCount="1" fill="freeze" />
          </polyline>
        </symbol>
        <mask id="mask">
          <use href="#arrow" />
        </mask>
      </defs>

      <use href="#arrow" />
      <rect width="100%" height="100%" fill="url(#bg)" mask="url(#mask)" />
    </svg><span class="download-btn__label">Start</span></button>
</section>
!

CSS 

              
                @use postcss-preset-env;
*,
*::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;
}

:root {
    --gradient-start: white;
    --gradient-stop-1: hsl(140, 20%, 90%);
    --label-text: hsl(120, 100%, 36%);
    --focus-border: hsla(120, 100%, 60%, 0.75);
    --shadow: hsla(140, 20%, 50%, 0.5);
    --shadow--hover: hsla(140, 20%, 50%, 0.15);
    --easing-func-btn: cubic-bezier(0.6, 0.18, 0, 1.36);
    --easing-func-pill: cubic-bezier(0.44, 0.25, 0.79, 2.02);
}

body {
    margin: 0;
    padding: 1.25em;
    height: 100%;
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: #001326
        radial-gradient(
            50vw 50vh ellipse at center,
            var(--gradient-start) 0%,
            var(--gradient-start) 30%,
            var(--gradient-stop-1) 100%
        );

    min-width: 440px;
    padding: 0;
}

.hidden {
    width: 1px;
    height: 1ox;
    position: absolute;
    color: transparent;
    overflow: hidden;
    font-size: 0.001em;
}

.progress-indicator {
    position: relative;
    width: 440px;
    height: 150px;
    margin: auto;
}

.progress-label {
    position: relative;
    transition: transform 0.2s 0.1s var(--easing-func-pill);
}

.progress-label--hover {
    transform: translateY(-30px);
}

.progress-label__value {
    position: absolute;
    left: 0;
    top: 0;
    width: 40px;
    text-align: right;
    font-family: 'Varela Round', sans-serif;
    font-size: 16px;
    color: var(--label-text);
    opacity: 0;
    z-index: 1000;
}

.progress-indicator__filtertarget {
    will-change: filter;
}

.progress-indicator__bar {
    width: 100%;
    height: 100%;
    overflow: visible;
    z-index: 0;
}

.progress-indicator__pill {
    transition: transform 0.2s var(--easing-func-pill);
}

.progress-indicator__pill--hover {
    transform: translateY(-30px);
}

.progress-indicator__shadow {
    stroke: var(--shadow);
    stroke-width: 8;
    transition-property: stroke, stroke-width, transform;
    transition-duration: 0.25s;
    transition-timing-function: var(--easing-func-pill);
}

.progress-indicator__shadow--hover {
    stroke: var(--shadow--hover);
    stroke-width: 18px;
    transform: translateX(12.5%) scale(0.75, 1);
}

.container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.filtered {
    filter: url('#dm-filter');
}

.download-btn {
    appearance: none;
    display: block;
    position: relative;
    cursor: pointer;
    width: 90px;
    height: 90px;
    margin: 0 auto;
    border: none;
    border-radius: 50%;
    filter: drop-shadow(0 14px 7px var(--shadow));
    color: white;
    padding: 10px;
    background: linear-gradient(var(--button-start) 40%, var(--button-start) 90%);
    background: transparent;

    transition-property: transform, filter;
    transition-duration: 0.4s;
    transition-timing-function: var(--easing-func-btn);

    &:hover {
        transform: translateY(14px);
        filter: drop-shadow(0 2px 4px var(--shadow));
    }

    &::after {
        display: block;
        border-radius: 50%;
        width: 70px;
        height: 70px;
        border: solid var(--focus-border) 1px;
        position: absolute;
        left: 10px;
        top: 10px;
        content: '';
    }

    &:active::after {
        animation: btn-active-anim 0.2s ease-out;
    }
}

.download-btn__label {
    position: absolute;
    font-size: 0.0001em;
    line-height: 0;
    color: transparent;
}

.download-arrow-icon {
    stroke-width: 3;
    stroke-linecap: round;
}

@keyframes btn-active-anim {
    from {
        opacity: 0;
        width: 70px;
        height: 70px;
    }

    75% {
        opacity: 1;
        border-width: 2px;
    }

    to {
        opacity: 0;
        width: 130px;
        height: 130px;
        left: -20px;
        top: -20px;
        border-width: 1px;
    }
}
!

JS 

              
                const suffix = webpSupported() ? 'webp' : 'jpg';
const filterTarget = document.querySelector('#target');
const progress = document.querySelector('#progress');
const btn = document.querySelector('#btn-download');
const labelWrapper = document.querySelector('.progress-label');
const label = document.querySelector('#progress-valuenow');
const syncedAnims = document.querySelectorAll('.js_syncStart');
const displaceAnim = document.querySelector('#displAnim');
const arrowHoverAnimIn = document.querySelector('#arrowHoverAnimIn');
const arrowHoverAnimOut = document.querySelector('#arrowHoverAnimOut');
const gradientHoverAnimIn = document.querySelector('#gradientHoverAnimIn');
const gradientHoverAnimOut = document.querySelector('#gradientHoverAnimOut');
const progressbar = document.querySelector('.progress-indicator__pill');
const dropShadow = document.querySelector('.progress-indicator__shadow');
const duration = 12000;
const totalLength = 360;
const labelAnimTiming = {
    duration: 500,
    fill: 'forwards',
    easing: 'ease-in'
}

let cancelled = false;
let labelAnim, startTime, valueAnimReq;

fetch(`https://assets.codepen.io/100347/fedm_progressbar.${suffix}`, {
    method: 'GET',
    headers: new Headers(),
    mode: 'cors',
    cache: 'default',
})
    .then((response) => {
        return response.blob();
    })
    .then((blob) => {
        const url =  URL.createObjectURL(blob);
        const feImage = document.querySelector('#feimage');
        feImage.setAttribute('href', url);
        setUp();
    });

const progressAnim = () => {
    let percent, position, status;
    let currentTime = Date.now() - startTime;

    if (currentTime >= duration) {
        return;
    }

    percent = currentTime / duration;
    position = percent * totalLength;
    status = `${Math.round(percent * 100)}%`

    label.setAttribute('style', `transform: translate3d(${position.toFixed(2)}px, 0px, 0);`);
    label.innerHTML = status;
    progress.setAttribute('aria-valuenow', status);
    valueAnimReq = requestAnimationFrame(progressAnim);
}

const labelAnimConf = (animateIn = true) => {
    const opacityIn = animateIn ? 0 : 1;
    const opacityout = !animateIn ? 0 : 1;

    return [
        { opacity: opacityIn },
        { opacity: opacityout }];
}

const startProgressAnim = () => {
    startTime = Date.now();
    labelAnim = label.animate(labelAnimConf(), labelAnimTiming);

    label.setAttribute('style', `transform: translate3d(0, 0, 0);`);
    valueAnimReq = requestAnimationFrame(progressAnim);
}

const start = () => {
    cancelled = false;
    filterTarget.classList.add('filtered');

    /* As SMIL syncing is screwed in Webkit and Blink we must roll something on our own:  */

    for (let anim of syncedAnims) {
        anim.beginElement();
    }

    btn.removeEventListener('click', start);
    btn.addEventListener('click', stop);
    startProgressAnim();
}

const stop = () => {
    cancelled = true;

    for (let anim of syncedAnims) {
        anim.endElement();
    }
}

const end = () => {
    const delay = cancelled ? 0 : 900;

    cancelAnimationFrame(valueAnimReq);
    progress.setAttribute('aria-valuenow', '0%');
    labelAnim = label.animate(labelAnimConf(false), labelAnimTiming);

    btn.removeEventListener('click', stop);

    setTimeout(() => {
        filterTarget.classList.remove('filtered');
        btn.addEventListener('click', start);
    }, delay);
}

const hoverInFunc = () => {
    labelWrapper.classList.add('progress-label--hover');
    progressbar.classList.add('progress-indicator__pill--hover');
    dropShadow.classList.add('progress-indicator__shadow--hover');
    arrowHoverAnimIn.beginElement();
    gradientHoverAnimIn.beginElement();
}

const hoverOutFunc = () => {
    labelWrapper.classList.remove('progress-label--hover');
    progressbar.classList.remove('progress-indicator__pill--hover');
    dropShadow.classList.remove('progress-indicator__shadow--hover');
    arrowHoverAnimOut.beginElement();
    gradientHoverAnimOut.beginElement();
}

function setUp() {
    displaceAnim.addEventListener('endEvent', end)
    btn.addEventListener('click', start);
    btn.addEventListener('mouseenter', hoverInFunc);
    btn.addEventListener('mouseleave', hoverOutFunc);
}
!
999px

Console