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HTML 

              
                <main id=app>
  <h1>Aqua Buttons</h1>

  <div class="static">
    <button>
      <span>
        Aqua button
      </span>
      <svg viewBox="0 0 22 22" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
        <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
        <line x1="5" y1="12" x2="19" y2="12"></line>
        <line x1="15" y1="16" x2="19" y2="12"></line>
        <line x1="15" y1="8" x2="19" y2="12"></line>
      </svg>

      <svg class="spinner" width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
        <path d="M10.14,1.16a11,11,0,0,0-9,8.92A1.59,1.59,0,0,0,2.46,12,1.52,1.52,0,0,0,4.11,10.7a8,8,0,0,1,6.66-6.61A1.42,1.42,0,0,0,12,2.69h0A1.57,1.57,0,0,0,10.14,1.16Z" />
      </svg>

    </button>
    <input id="size" type="range" min=0.5 max=3.5 value=2 step=0.1 title="Size">
    <input id="blur" type="range" min=0 max=3 value=0 step=0.1 title="Frosted Glass Magnitude">
  </div>

  <div class="custom">
    <button>
      <span>
        Randomize
      </span>
      <svg viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
        <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
        <path d="M12 21a9 9 0 0 1 0 -18c4.97 0 9 3.582 9 8c0 1.06 -.474 2.078 -1.318 2.828c-.844 .75 -1.989 1.172 -3.182 1.172h-2.5a2 2 0 0 0 -1 3.75a1.3 1.3 0 0 1 -1 2.25"></path>
        <circle cx="8.5" cy="10.5" r="1"></circle>
        <circle cx="12.5" cy="7.5" r="1"></circle>
        <circle cx="16.5" cy="10.5" r="1"></circle>
      </svg>

    </button>

    <input id="hue1" type="range" min=0 max=360 value=30 title="Background Hue">
    <input id="sat1" type="range" min=0 max=100 value=50 title="Background Saturation">
    <input id="hue2" type="range" min=0 max=360 value=5 title="Foreground Hue">
    <input id="sat2" type="range" min=0 max=100 value=80 title="Foreground Saturation">
    <input id="gradoff" type="range" orient="vertical" min="20" max="120" value=50 title="Transition Position">
    <input id="grad" type="range" orient="vertical" min="10" max="40" value=30 title="Transition Size">
  </div>
  
  
  <button class="single">
    single element
  </button>
  
  <p>design inspiration from <a href="https://twitter.com/alazybrick/status/1600191967907938320">@alazybrick on Twitter</a></p>
</main>
!

CSS 

              
                :root {
  --hue: 190deg;
  --sat: 50%;
  --blur: 0em;
  
  
  --hue2: calc(var(--hue) + 60deg);
  --sat2: calc(var(--sat) + 10%);
  --clr: hsl(var(--hue) var(--sat) 90%);  
  --clr2: hsl(var(--hue2) var(--sat2) 85%);
  --text: hsla(var(--hue), 70%, 10%, .9);
  --gradoffset: 45%;
  --gradgap: 30%;
}

#app div {
  --hue2: calc(var(--hue) + 60deg);
  --sat2: calc(var(--sat) + 10%);
  --clr: hsl(var(--hue) var(--sat) 90%);  
  --clr2: hsl(var(--hue2) var(--sat2) 85%);
  --text: hsla(var(--hue), 70%, 10%, .9);
  --gradoffset: 45%;
  --gradgap: 30%;
}

#app .custom {
  --hue: 30deg;
  --sat: 50%;
  --hue2: 5deg;
  --sat2: 80%;
}

button {
  
  font-size: calc(var(--size,2vw) * 2 );
  @media screen and ( min-width: 660px ) {
    font-size: var(--size,2vw);
  }
  
  color: var(--text);
  font-weight: 500;
  letter-spacing: -0.025em;
  background-color: var(--clr);
  background-image:   
    linear-gradient(180deg, 
      var(--clr2) var(--gradgap), 
      transparent calc(100% - var(--gradgap))
    );
  background-repeat: no-repeat;
  background-position: center var(--gradoffset);
  background-size: 100% 200%;
  padding: 1.1em 1.5em;
  border-radius: 2em;
  border: none;
  overflow: hidden;
  justify-content: center;
  margin: auto;
  
  box-shadow: 
    0 -0.5em 0.5em transparent,
    0 0.5em 0.5em transparent,
    0 0.25em 0.3em -0.2em hsla(var(--hue), var(--sat), 50%, 0.46), 
    0 0.25em 0.75em hsla(var(--hue), calc(var(--sat) - 10%), 40%, 0.3);

  position: relative;
  transition: all 0.5s linear(0, 0.176 4.5%, 0.331 9%, 0.47 13.6%, 0.595 18.4%, 0.704 23.3%, 0.752 25.8%, 0.795 28.3%, 0.836 30.9%, 0.872 33.5%, 0.905 36.1%, 0.934 38.8%, 0.957 41.3%, 0.977 43.8%, 0.995 46.4%, 1.009 49%, 1.021 51.7%, 1.031 54.5%, 1.038 57.3%, 1.042 60.3%, 1.045 65.2%, 1.041 70.6%, 1.034 76.1%, 1.007 91.2%, 1.002 95.8%, 1);
  outline: none;

  &::before, &::after {
    content: "";
    inset: 0;
    position: absolute;
    border-radius: 5em;
  }
  
  // darkening
  &::before {
    background-image: 
      radial-gradient(ellipse, 
        hsla(var(--hue), 100%, 90%, .8) 20%,
        transparent 50%,
        transparent 200%
      ),
      linear-gradient(90deg, 
        hsl(0deg, 0%, 25%) -10%, 
        transparent 30%, 
        transparent 70%, 
        hsl(0deg, 0%, 25%) 110%
      );
    box-shadow: 
      inset 0 .25em .75em hsla(0deg, 0%, 0%, 0.8),
      inset 0 -.05em .2em rgba(255, 255, 255, 0.4),
      inset 0 -1px 3px hsla(var(--hue), 80%, 50%, .75);
    background-blend-mode: overlay;
    background-repeat: no-repeat;
    background-size: 200% 80%, cover;
    background-position: center 220%;
    mix-blend-mode: overlay;
    filter: blur(calc(var(--blur) / 32));
  }
  
  // reflection
  &::after {
    background: linear-gradient(
      180deg, 
      hsla(var(--hue2),100%,90%,.9), 
      hsla(var(--hue2),calc(var(--sat2)*0.7),50%,.75) 40%, 
      transparent 80%
    );
    top: 0.075em;
    left: 0.75em;
    right: 0.75em;
    bottom: 1.4em;
    filter: blur(calc(var(--blur) / 16));
    mix-blend-mode: screen;
  }
  
  &:hover,
  &:active,
  &:focus {
    outline: none;
    box-shadow: 
      0 -0.2em 0.5em hsla(var(--hue2), 70%, 80%, 0.3), 
      0 0.25em 0.5em hsla(var(--hue), 70%, 80%, 0.25), 
      0 0.25em 0.3em -0.2em hsl(var(--hue), 90%, 70%), 
      0 0.25em 0.5em hsla(var(--hue), 20%, 30%, 0.2), 
      inset 0 -2px 2px rgba(255, 255, 255, 0.2);
    background-position: center calc( var(--gradoffset) - 0.75em );
  }
  
  &:active {
    scale: 0.95;
    transition: all 0.25s linear(0, 0.028 5.2%, 0.056 9.8%, 0.085 13.8%, 0.116 17.4%, 0.149 20.7%, 0.187 23.9%, 0.229 26.9%, 0.278 29.9%, 0.328 32.6%, 0.383 35.3%, 0.445 38%, 0.513 40.7%, 0.636 45.2%, 0.898 54.1%, 0.999 57.7%, 0.89 62.3%, 0.85 64.3%, 0.819 66.2%, 0.795 68.1%, 0.778 69.9%, 0.768 71.7%, 0.765 73.6%, 0.767 75.1%, 0.774 76.6%, 0.785 78.2%, 0.8 79.8%, 0.837 82.8%, 0.934 89.6%, 0.956 91.4%, 0.973 93.1%, 0.986 94.8%, 0.994 96.4%, 0.999 98.1%, 1);
  }
  
}



.static button {
  position: relative;
}
.static button .spinner {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translateY(.75em) translateX(-50%);
  opacity: 0;
  margin: 0;
  font-size: 2em;
  mix-blend-mode: overlay;
}
.static button span,
.static button svg,
.static button .spinner {
  transition: all 0.33s ease;
}

.static button:active,
.static button:focus {
  span,
  svg:not(.spinner) {
    transform: translateY(-1em);
    opacity: 0;
    filter: blur(5px);
  }
  .spinner {
    transform: translateY(-0.5em) translateX(-50%);
    opacity: 1;
  }
}










// app styles

body {
  --font: "Noto Sans", sans-serif;
  color: white;
  background: #3b3d4c;
  font-family: var(--font);
  font-weight: 200;
  padding: 1vw;
  text-align: center;
}

button {
  font-family: var(--font);
  display: flex;
}

svg {
  height: 1em;
  width: auto;
  margin-left: .33em;
}

button svg,
button span {
  display: inline-flex;
  align-content: center;
  align-self: center;
  filter: drop-shadow(0 1px 0 hsla(var(--hue), 90%, 88%, 1));
}

#app {
  display: grid;
  gap: 2vw;
  @media screen and (min-width: 660px) {
    grid-template-columns: auto auto;
    grid-template-rows: min-content 2fr 1fr min-content;
  }
}

h1, p, button {
  grid-column: 1/-1;
}

h1 { margin: 0.5em 0 0; }


#app > div {
  position: relative;
  border-radius: 2vw;
  min-height: 200px;
  background-color: hsl(var(--hue), 20%, 95%);
  background-image: 
    linear-gradient( 33deg, 
      transparent 60%, 
      var(--clr) 
    ),
    linear-gradient( 210deg, 
      transparent 60%, 
      var(--clr2) 
    );
  background-size: 150%;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: rgba(0, 0, 0, 0.15) 0px 15px 25px, rgba(0, 0, 0, 0.05) 0px 5px 10px;
}

body, html, #app {
  height: 100%;
  box-sizing: border-box;
}

a {
  color: #6adcf6;
}

input[type=range] {
  position: absolute;
  top: .5em;
  left: .5em;
  right: .5em;
  width: 40%;
}

#hue1 {
  top: auto;
  bottom: .5em;
}

#sat1 {
  top: auto;
  bottom: .5em;
  left: auto;
}

#hue2 {
}

#sat2 {
  left: auto;
}

#grad {
  left: auto;
  top: 50%;
  transform: translateY(-50%);
}
#gradoff {
  top: 50%;
  transform: translateY(-50%);
}

#blur {
  top: auto;
  bottom: .5em;
  left: 50%;
  transform: translateX(-50%);
}

#size {
  top: .5em;
  left: 50%;
  transform: translateX(-50%);
}












input {
  font-family: inherit;
  color: white;
  background: #3b3d4c;
  padding: 0.875em;
  border-radius: 8px;
  border: 1px solid transparent;
  outline: 1px solid transparent;
  accent-color: var(--clr);
  box-shadow: 0 3px 2px -3px var(--clr);
  transition: border 0.3s ease-in, outline 0.6s ease-in, box-shadow 0.6s ease-in;

  &:focus {
    border-color: var(--clr2);
    outline-color: var(--clr2);
    transition: border 0.6s ease-out, outline 0.3s ease-out,
      box-shadow 0.3s ease-out;
  }

  &::placeholder {
    opacity: 0.33;
    font-style: italic;
  }
}

input[type="range"] {
  appearance: none;
  height: calc(1em + 2px * 2);
  background: #3b3d4c;
  border: none;
  outline: none;
  padding: 5px;
  border-radius: 1em;

  &,
  &* {
    transition: all 0.5s ease;
  }
}

@mixin range-thumb {
  appearance: none;
  width: 1em;
  height: 1em;
  border: none;
  outline: none;
  background: #eee;
  border-radius: 1em;
  transform: translate3d(0, 0, 0);
}

@mixin range-track {
  background: #3b3d4c;
  display: block;
  width: calc(100% + 5px * 2);
  height: calc(1em + 5px * 2);
  border-radius: 1em;
  margin-inline: calc(5px * -1);
  transition: opacity 0.5s ease-in, background 0.5s ease-in;
  opacity: 0;
  will-change: opacity, background;
}

input[type="range"]::-webkit-slider-runnable-track {
  @include range-track;
  background: #3b3d4c;
  padding: 0.25em 5px;
  opacity: 1;
}
input[type="range"]::-moz-range-track {
  @include range-track;
}
input[type="range"]::-ms-track {
  @include range-track;
}

input[type="range"]::-webkit-slider-thumb {
  @include range-thumb;
}
input[type="range"]::-moz-range-thumb {
  @include range-thumb;
}
input[type="range"]::-ms-thumb {
  @include range-thumb;
}

input[type="range"][orient="vertical"]{
  writing-mode: bt-lr;
  height: 120px;
  width: calc(1em + 2px * 2);
  appearance: slider-vertical;
}



.spinner path {
  transform-origin: center;
  animation: spin .75s infinite linear
}

@keyframes spin {
  100% {
    transform: rotate(360deg)
  }
}
!

JS 

              
                let randomise = () => {
  
  $("#hue1").val( Math.floor(Math.random() * 360) );
  $("#sat1").val( Math.floor(Math.random() * 360) );
  $("#hue2").val( Math.floor(Math.random() * 70) + 15 );
  $("#sat2").val( Math.floor(Math.random() * 70) + 15 );
  $("#grad").val( Math.floor(Math.random() * 10) + 20 );
  $("#gradoff").val( Math.floor(Math.random() * 20) + 40 );
  
  $(".custom").css({
    "--hue":  $("#hue1").val() + "deg",
    "--sat":  $("#sat1").val() + "%",
    "--hue2": $("#hue2").val() + "deg",
    "--sat2": $("#sat2").val() + "%",
    "--gradgap": $("#grad").val() + "%",
    "--gradoffset": $("#gradoff").val() + "%"
  });
}

setTimeout( () => {
  $("input[type=range]").on("input", (e) => {
    $(".custom").css({
      "--hue":  $("#hue1").val() + "deg",
      "--sat":  $("#sat1").val() + "%",
      "--hue2": $("#hue2").val() + "deg",
      "--sat2": $("#sat2").val() + "%",
      "--gradgap": $("#grad").val() + "%",
      "--gradoffset": $("#gradoff").val() + "%"
    });
    $("#app").css({
      "--blur": $("#blur").val() + "em",
      "--size": $("#size").val() + "vw"
    });
  });
}, 1000 );

$(".custom button").on("click", randomise);














function HexToHSL(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);

    var r = parseInt(result[1], 16);
    var g = parseInt(result[2], 16);
    var b = parseInt(result[3], 16);

    r /= 255, g /= 255, b /= 255;
    var max = Math.max(r, g, b), min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;

    if(max == min){
        h = s = 0; // achromatic
    } else {
        var d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        switch(max) {
            case r: h = (g - b) / d + (g < b ? 6 : 0); break;
            case g: h = (b - r) / d + 2; break;
            case b: h = (r - g) / d + 4; break;
        }
        
        h /= 6;
    }

    s = s*100;
    s = Math.round(s);
    l = l*100;
    l = Math.round(l);
    h = Math.round(360*h);

    return {h, s, l};
}
!
999px

Console