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HTML

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CSS

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CSS Base

About CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <main>
  <button aria-label="Say Hello">
    <div>
      <span class="inner">
        <div class="particles" aria-hidden="true"></div>
        <span class="text">Say hello</span>
        <span class="halo" aria-hidden="true"></span>
      </span>
    </div>
    <span class="shadow" aria-hidden="true"></span>
  </button>
</main>


<div id="info-box" data-info-chrome="Rendering in Chrome" data-info-safari="Rendering in Safari" data-info-firefox="Rendering in Firefox" data-presentation-width="50vw" data-presentation-height="50vh" data-inspiration="https://twitter.com/adrienrochet/status/1642127496823930882" data-hidden-onLoad="false"></div>
!

CSS 

              
                @layer properties {
  @property --shadow-scale {
    syntax: "<number>";
    inherits: true;
    initial-value: 0;
  }
  @property --halo-scale {
    syntax: "<number>";
    inherits: true;
    initial-value: 0;
  }
  @property --halo-offset {
    syntax: "<number>";
    inherits: true;
    initial-value: 0;
  }
}

:root {
  --debug: 0;

  --bg-color: hsl(0, 0%, 8%);
  --svg-animation: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 122 116'%3E%3Cpath id='b' stroke='%23fff' stroke-linecap='round' stroke-width='0' d='M17.9256 115C17.434 111.774 13.1701 104.086 13.4282 95.6465C13.6862 87.207 18.6628 76.0721 17.9256 64.3628C17.1883 52.6535 8.7772 35.9512 9.00452 25.3907C9.23185 14.8302 16.2114 5.06512 17.9256 1'%3E%3C/path%3E%3Cpath id='d' stroke='%23fff' stroke-linecap='round' stroke-width='0' d='M84.1628 115C85.2376 112.055 94.5618 98.8394 93.9975 91.1338C93.4332 83.4281 82.5505 73.2615 84.1628 62.5704C85.775 51.8793 96.4803 35.4248 95.9832 25.7826C95.4861 16.1404 87.9113 4.71163 84.1628 1'%3E%3C/path%3E%3Cpath id='f' stroke='%23fff' stroke-linecap='round' stroke-width='0' d='M37.0913 115C37.9604 111.921 44.4347 99.4545 45.3816 92.9773C48.9305 68.7011 35.7877 73.9552 37.0913 62.7781C38.3949 51.6011 47.3889 36.9895 46.9869 26.9091C46.585 16.8286 40.1222 4.88034 37.0913 1'%3E%3C/path%3E%3Cpath id='h' stroke='%23fff' stroke-linecap='round' stroke-width='0' d='M112.443 115C111.698 112.235 108.25 106.542 107.715 93.7582C107.241 82.4286 107.229 83.9543 112.443 66.1429C116.085 44.0408 100.661 42.5908 101.006 33.539C101.35 24.4871 109.843 4.48439 112.443 1'%3E%3C/path%3E%3Cg%3E%3Ccircle r='1.5' fill='%23D9D9D9'%3E%3CanimateMotion dur='12s' repeatCount='indefinite'%3E%3Cmpath href='%23b'%3E%3C/mpath%3E%3C/animateMotion%3E%3C/circle%3E%3C/g%3E%3Cg%3E%3Ccircle r='1' fill='%23fff' fill-opacity='1' shape-rendering='crispEdges'%3E%3CanimateMotion dur='8s' repeatCount='indefinite'%3E%3Cmpath href='%23d'%3E%3C/mpath%3E%3C/animateMotion%3E%3C/circle%3E%3C/g%3E%3Cg%3E%3Ccircle r='.5' fill='%23fff' fill-opacity='1' shape-rendering='crispEdges'%3E%3CanimateMotion dur='10s' repeatCount='indefinite'%3E%3Cmpath href='%23f'%3E%3C/mpath%3E%3C/animateMotion%3E%3C/circle%3E%3C/g%3E%3Cg%3E%3Ccircle r='.8' fill='%23fff' fill-opacity='1' shape-rendering='crispEdges'%3E%3CanimateMotion dur='6s' repeatCount='indefinite'%3E%3Cmpath href='%23h'%3E%3C/mpath%3E%3C/animateMotion%3E%3C/circle%3E%3C/g%3E%3C/svg%3E");

  --btn-radius: 12;
 
  --animation-timing-function: ease-in-out;

  --transitions: --shadow-scale 0.3s var(--animation-timing-function),
    --halo-scale 0.3s var(--animation-timing-function),
    --halo-offset 0.3s var(--animation-timing-function),
    transform 0.2s var(--animation-timing-function);

  --color-a: hsl(249.8 100% 50%);
  --color-b: hsl(259.15 100% 40%);
  --color-c: hsl(281.28 100% 56.01%);
}

@supports (color: color(display-p3 0 0 0)) {
  body {
    --color-a: color(display-p3 0.16 0.1 0.99);
    --color-b: color(display-p3 0.23 0 0.77);
    --color-c: color(display-p3 0.68 0.08 1);
  }
}

*,
*:before,
*:after {
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  outline: calc(var(--debug) * 1px) dotted
    hsl(calc(var(--debug) * 10 * 1deg) 60% 60%);
}

html,
body,
main {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg-color);
  font-family: "Mona Sans", sans-serif;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;

  transform: scale(2);
  position: relative;

  & button {
    --halo-scale: 0;
    --halo-offset: 100;
    --shadow-scale: 0;

    all: unset;
    font-family: "Inter", sans-serif;
    cursor: pointer;
    color: white;
    max-height: 46px;
    font-size: 22px;

    box-shadow: 0px 1px 3px rgba(0, 0, 0, 0.1);
    border-radius: calc(var(--btn-radius) * 1px);
    background: linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.1) 0%,
      rgba(255, 255, 255, 0) 100%
    );

    position: relative;
    transition: var(--transitions);

    & > div {
      overflow: hidden;
      position: relative;
      border-radius: calc(var(--btn-radius) * 1px);
    }

    & .inner {
      display: block;
      background: hsl(300deg 0% 13% / 100%);
      position: relative;
      width: calc(100% - 1px);
      height: calc(100% - 1px);
      top: 1px;
      left: 1px;
      border-radius: calc(var(--btn-radius) * 1px);
      &:before,
      &:after {
        content: "";
        display: block;
        position: absolute;
        width: 70%;
        height: 1px;
        top: -1px;
        left: 50%;
        background: linear-gradient(
          90deg,
          rgba(255, 255, 255, 0) 0%,
          rgba(255, 255, 255, 0.25) 50%,
          rgba(255, 255, 255, 0) 100%
        );
        transform: translateX(-50%);
        opacity: 0.6;
      }
      &:before {
        mix-blend-mode: overlay;
      }
      &:after {
        top: calc(100% - 2px);
        opacity: var(--halo-scale);
        background: linear-gradient(
          90deg,
          rgba(255, 255, 255, 0) 0%,
          rgb(255 255 255 / 50%),
          rgba(255, 255, 255, 0) 100%
        );
        filter: brightness(200%) opacity(0.3);
      }
    }

    & .particles {
      background-image: var(--svg-animation), var(--svg-animation);
      background-repeat: no-repeat, repeat;
      background-position: center, center top 100%;
      background-size: 100% 100%, 50%;
      -webkit-mask-image: linear-gradient(
        to top,
        transparent,
        black,
        transparent
      );
      border-radius: calc(var(--btn-radius) * 1px);
      width: 100%;
      height: 100%;
      position: absolute;
      opacity: var(--halo-scale);

      /* Since having the blurry filter creates a weird artefact on safari
         I decided to doulbe the particles background in a pseudo-element
         And apply the blur filter on it.
      */
      &:before {
        content: "";
        display: block;
        position: absolute;
        width: 100%;
        height: 100%;
        background-image: var(--svg-animation), var(--svg-animation),
          var(--svg-animation); // The third one is to make a kind of bokeh effect
        background-repeat: no-repeat, repeat, repeat;
        background-position: center, center top 100%, center center;
        background-size: 100% 100%, 50%, 120%;
        filter: blur(1px);
        border-radius: calc(var(--btn-radius) * 1px);
        // Fix for safari
        will-change: filter;
      }
    }

    & .text {
      position: relative;
      z-index: 2;
      padding: 0.545em 1.455em;
      width: max-content;
      display: block;
      background: linear-gradient(
        180deg,
        #ffffff 0%,
        rgba(255, 255, 255, 0.7) 100%
      );
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-fill-color: transparent;
      text-shadow: 0px 2px 2px rgba(0, 0, 0, 0.25);
    }

    & .halo {
      border-radius: calc(calc(var(--btn-radius)+1) * 1px);
      overflow: hidden;
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      border-radius: calc(var(--btn-radius) * 1px);

      &:before {
        content: "";
        display: block;
        width: 80%;
        height: 60%;
        position: absolute;
        top: 80%;
        left: 50%;
        background: linear-gradient(
          180deg,
          var(--color-a) 0%,
          var(--color-b) 39.33%,
          var(--color-c) 59%
        );
        filter: blur(12px) saturate(1.2);
        transform: translateX(-50%) translateY(calc(var(--halo-offset) * 1%))
          scale(var(--halo-scale));
        // Fix for safari
        will-change: filter;
      }
    }

    //&:focus,
    &:hover {
      --halo-scale: 1;
      --shadow-scale: 1;
      --halo-offset: -70;
    }

    &:active {
      --halo-scale: 1.1;
      --halo-offset: -80;
      --shadow-scale: 1.2;

      transform: translateY(calc(var(--halo-scale) * 1px));
    }
  }

  /* I did not found a better way to achieve that with less dom. 
   *
   * Due to the button having a overflow: hidden;
   *
  */
  & .shadow {
    position: absolute;
    width: 60%;
    height: 20%;
    bottom: -26%;
    z-index: -1;
    left: 0;
    right: 0;
    margin: auto;
    border-radius: 1e5%;
    /* let's reuse the same variable */
    transform: scale(var(--shadow-scale));
    opacity: calc(var(--halo-scale) / 2);

    background: linear-gradient(
      to bottom,
      var(--color-c),
      var(--color-b),
      var(--color-a)
    );
    filter: blur(8px) opacity(0.7);
    // Fix for safari
    will-change: filter;
  }
}

/* 
  Fallback for browsers who do not support registerProperty.
  ( Which cannot use variables transitions )
*/

body.registerProperty-not-supported {
  & button .inner:after {
    transition: opacity 0.3s ease;
  }
  & button,
  & button .halo:before {
    transition: transform 0.3s ease;
  }

  & button .shadow {
    transition: transform 0.3s ease, opacity 0.3s ease;
  }
}
!

JS 

              
                // No JS for this rendering 🙏

// The only JS files used are for the presentation deck 
// And to detect support for the CSS registerProperty.
!
999px

Console