HTMLify

@import url("https://fonts.googleapis.com/css?family=Poppins:200,300,400,500,600,700,800,900wght&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  background: #222;
}

.box {
  position: absolute;
  width: 80px;
  height: 500px;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #333;
  border-radius: 50px;
  box-shadow: 0 5px 50px rgba(0, 0, 0, 0.5);
}

.spinner {
  position: relative;
  width: 40px;
  gap: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  user-select: none;
}

.progress {
  position: relative;
  width: 10px;
  background: #222;
  height: 300px;
  border-radius: 20px;
  display: flex;
  flex-direction: column-reverse;
}

.progress #meter {
  position: absolute;
  width: 100%;
  background: #0f0;
  border-radius: 20px;
  filter: drop-shadow(0 0 2.5px #0f0) drop-shadow(0 0 10px #0f0);
  transition: 0.5s;
}

.btn {
  position: relative;
  width: 40px;
  height: 40px;
  text-align: center;
  line-height: 40px;
  background: #444;
  font-size: 1.5em;
  color: #fff;
  border-radius: 50%;
  text-shadow: 0 0 5px #fff, 0 0 10px #fff;
  cursor: pointer;
  font-weight: 500;
}

.btn:active {
  font-size: 1.25em;
  box-shadow: inset 0 0 15px rgba(0, 0, 0, 0.9);
}

#output {
  position: relative;
  color: #fff;
  font-size: 2em;
  text-shadow: 0 0 5px #fff;
}