<button class="btn-101">
  Glow Button
  <svg>
    <defs>
      <filter id="glow">
        <fegaussianblur result="coloredBlur" stddeviation="5"></fegaussianblur>
        <femerge>
          <femergenode in="coloredBlur"></femergenode>
          <femergenode in="coloredBlur"></femergenode>
          <femergenode in="coloredBlur"></femergenode>
          <femergenode in="SourceGraphic"></femergenode>
        </femerge>
      </filter>
    </defs>
    <rect />
  </svg>
</button>
				
			
				
					.btn-101,
.btn-101 *,
.btn-101 :after,
.btn-101 :before,
.btn-101:after,
.btn-101:before {
  border: 0 solid;
  box-sizing: border-box;
}
.btn-101 {
  -webkit-tap-highlight-color: 
transparent;
  -webkit-appearance: button;
  background-color: 
#000;
  background-image: none;
  color: 
#fff;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    Segoe UI, Roboto, Helvetica Neue, Arial, Noto Sans, sans-serif,
    Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol, Noto Color Emoji;
  font-size: 100%;
  font-weight: 900;
  line-height: 1.5;
  margin: 0;
  -webkit-mask-image: -webkit-radial-gradient(#000, #fff);
  padding: 0;
  text-transform: uppercase;
}
.btn-101:disabled {
  cursor: default;
}
.btn-101:-moz-focusring {
  outline: auto;
}
.btn-101 svg {
  vertical-align: middle;
}
.btn-101 [hidden] {
  display: none;
}
.btn-101 {
  --thickness: 0.3rem;
  --roundness: 1.2rem;
  --color: 
#eff6ff;
  --opacity: 0.6;
  -webkit-backdrop-filter: blur(100px);
  backdrop-filter: blur(100px);
  background: none;
  background: 
hsla(0, 0%, 100%, 0.2);
  border: none;
  border-radius: var(--roundness);
  color: var(--color);
  cursor: pointer;
  display: block;
  font-family: Poppins, "sans-serif";
  font-size: 1rem;
  font-weight: 500;
  padding: 0.8rem 3rem;
  position: relative;
}
.btn-101:hover {
  background: 
hsla(0, 0%, 100%, 0.3);
  filter: brightness(1.2);
}
.btn-101:active {
  --opacity: 0;
  background: 
hsla(0, 0%, 100%, 0.1);
}
.btn-101 svg {
  border-radius: var(--roundness);
  display: block;
  filter: url(#glow);
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
}
.btn-101 rect {
  fill: none;
  stroke: var(--color);
  stroke-width: var(--thickness);
  rx: var(--roundness);
  stroke-linejoin: round;
  stroke-dasharray: 185%;
  stroke-dashoffset: 80;
  -webkit-animation: snake 2s linear infinite;
  animation: snake 2s linear infinite;
  -webkit-animation-play-state: paused;
  animation-play-state: paused;
  height: 100%;
  opacity: 0;
  transition: opacity 0.2s;
  width: 100%;
}
.btn-101:hover rect {
  -webkit-animation-play-state: running;
  animation-play-state: running;
  opacity: var(--opacity);
}
@-webkit-keyframes snake {
  to {
    stroke-dashoffset: 370%;
  }
}
@keyframes snake {
  to {
    stroke-dashoffset: 370%;
  }
}