Code Playground

@charset "UTF-8";
@import url(https://fonts.googleapis.com/css?family=Nunito+Sans:300,400,600,700,800);
*,
:after,
:before {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
}
.countdown{
  --number-color: hsl(0 0% 100%);
  --text-color: hsl(0 0% 25%);
  --dot-color: hsl(0 0% 10%);
  --dot-color-remaining: hsl(182, 100%, 66%);
  --dot-color-active: hsl(0 100% 50%);
  font-family: system-ui, sans-serif;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  width: min(60rem, 100%);
  margin-inline: auto;
  container: inline-size;
  > .part {
    aspect-ratio: 1/1;
    display: grid;
    place-items: center;
    > .remaining {
      grid-area: 1/1;
      color: hsl(0 0% 100%);
      display: grid;
      text-align: center;
      font-size: 4cqi;
      >.number {
        color: var(--number-color);
      }
      >.text {
        color: var(--text-color);
        text-transform: uppercase;
        font-size: 0.5em;
      }
    }
    > .dot-container {
      grid-area: 1/1;
      height: 100%;
      width: 4%;
      rotate: calc(360deg / var(--dots) * var(--dot-idx));
      > .dot {
        width: 100%;
        aspect-ratio: 1/1;
        background-color: var(--dot-color);
        border-radius: 50%;
        transition: background-color .25s;
        &[data-active=true]{
          background-color: var(--dot-color-remaining);
          &[data-lastactive=true]{
            background-color: var(--dot-color-active);
          }
        }
      }
    }
  }
}

* { box-sizing: border-box }
html, body { height: 100% }
body {
  margin: 0;
  padding: 2rem;
  background-color: hsl(0 0% 0%);
  display: grid;
  gap: 1rem;
  align-content: center;
}
h1 {
  font-family: system-ui, sans-serif;
  color: hsl(0 0% 100%);
  text-align: center;
  >span:last-of-type{
    color: hsl(182 100% 66%)
  }
}

console.log("Event Fired")
const countdownEls = document.querySelectorAll(".countdown")
countdownEls.forEach(countdownEl => createCountdown(countdownEl))

function createCountdown(countdownEl){
  const target = new Date(new Date(countdownEl.dataset.targetDate).toLocaleString('en', ))
  const parts = {
    days: {text: ["days","day"], dots: 30},
    hours: {text: ["hours","hour"], dots: 24},
    minutes: {text: ["minutes","minute"], dots: 60},
    seconds: {text: ["seconds","second"], dots: 60},
  }

Object.entries(parts).forEach(([key, value])=>{
    const partEl = document.createElement("div");
    partEl.classList.add("part", key);
    partEl.style.setProperty("--dots", value.dots);
    value.element = partEl;

const remainingEl = document.createElement("div");
    remainingEl.classList.add("remaining");
    remainingEl.innerHTML = `
      <span class="number"></span>
      <span class="text"></span>
    `
    partEl.append(remainingEl);
    for(let i = 0; i < value.dots; i++){
      const dotContainerEl = document.createElement("div");
      dotContainerEl.style.setProperty("--dot-idx", i);
      dotContainerEl.classList.add("dot-container")
      const dotEl = document.createElement("div");
      dotEl.classList.add("dot")
      dotContainerEl.append(dotEl);
      partEl.append(dotContainerEl);
    }
    countdownEl.append(partEl);
  })
  getRemainingTime(target, parts)
}

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