style.css

@import url("https://fonts.googleapis.com/css?family=Montserrat&display=swap");

:root {
  --background-color: #046973;
  --large-circle-color: #010f1c;
  --light-color: #dcebfe;
  --gradient-color-light: #5fa0ac;
  --gradient-color-light-border: #65a3ad;
  --gradient-color-dark: #004a54;
  --gradient-color-dark-border: #03505a;
}

* {
  box-sizing: border-box;
}

body {
  background: var(--background-color) url('https://images.unsplash.com/photo-1601142754133-ae7aa279c3d5?ixid=MXwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHw%3D&ixlib=rb-1.2.1&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
  color: var(--light-color);
  font-family: "Montserrat", sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  overflow: hidden;
  margin: 0;
}

h1 {
  position: absolute;
  top: 1rem;
  left: 2rem;
  font-size: 1.5rem;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto;
  width: 300px;
  height: 300px;
  position: relative;
  transform: scale(1);
}

.circle {
  background-color: var(--large-circle-color);
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: -1;
}

.gradient-circle {
  background: conic-gradient(
    var(--gradient-color-light) 0%,
    var(--gradient-color-light-border) 21%,
    var(--light-color) 21%,
    var(--light-color) 58%,
    var(--gradient-color-dark-border) 58%,
    var(--gradient-color-dark) 100%
  );
  width: 320px;
  height: 320px;
  border-radius: 50%;
  position: absolute;
  top: -10px;
  left: -10px;
  z-index: -2;
}

.pointer {
  background-color: var(--light-color);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: block;
}

.pointer-container {
  position: absolute;
  top: -40px;
  left: 140px;
  width: 20px;
  height: 190px;
  animation: rotate 19s linear forwards infinite;
  transform-origin: bottom center;
}

@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.container.grow {
  animation: grow 4s linear forwards;
}

@keyframes grow {
  from {
    transform: scale(1);
  }
  to {
    transform: scale(1.2);
  }
}

.container.shrink {
  animation: shrink 8s linear forwards;
}

@keyframes shrink {
  from {
    transform: scale(1.2);
  }
  to {
    transform: scale(1);
  }
}