Water Wave Filling Box with Animation - Autoscales

index.html

<div class="indicator">
  <output name="result" for="completion">50</output>
</div>

<input id="completion" type="range" min="0" max="100">

script.babel

const input = document.querySelector("input");
const indicator = document.querySelector(".indicator");
const output = document.querySelector("output");
input.addEventListener("input", (e) => {
  setValue(e.target.value);
});

function setValue(val) {
  output.value = val;
  indicator.setAttribute(
    "style",
    `
    --completion: ${val}%
  `
  );
}

style.scss

:root {
  --completion: 50%;
  /*The top offset for the wave*/
  --offset: 2vh;
}
body {
  display: grid;
  place-content: center;
  height: 100vh;
  background: #333;
}
.indicator {
  height: 20vh;
  width: 20vh;
  position: relative;
  border-radius: 50%;
  border: 4px double white;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
}
output {
  z-index: 1;
  font-family: system-ui;
  font-size: 10vh;
  color: #333;
}
.indicator::after {
  display: block;
  width: 40vh;
  height: 40vh;
  content: "";
  background-color: #a4eafd;
  border-radius: 15vh;
  position: absolute;
  left: 50%;
  top: calc(100% - var(--completion) + var(--offset));
  translate: -50% 0;
  animation: spin 5s linear infinite;
}

@keyframes spin {
  100% {
    rotate: 360deg;
  }
}

water-wave-filling-box-with-animation-autoscales.markdown

Water Wave Filling Box with Animation - Autoscales

A Pen by Praveen Puglia on CodePen.

License.