Speed Meter Animation | HTML, CSS & JavaScript

body {
  margin: 0;
  height: 100vh;
  background: #020617;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

/* MULTICOLOR GLOW */
.glow-bg {
  position: absolute;
  width: 650px;
  height: 650px;
  border-radius: 50%;
  background: conic-gradient(
    red, orange, yellow, lime, cyan, blue, violet, red
  );
  filter: blur(80px);
  opacity: 0;
  transform: scale(0.6);
  transition: all 0.6s ease;
}

/* ACTIVE STATE */
.glow-bg.active {
  opacity: 0.8;
  transform: scale(1.2);
  animation: rotateGlow 6s linear infinite, pulseGlow 2s ease-in-out infinite;
}

/* Rotation */
@keyframes rotateGlow {
  from { transform: rotate(0deg) scale(1.2); }
  to { transform: rotate(360deg) scale(1.2); }
}

/* Pulse */
@keyframes pulseGlow {
  0% { opacity: 0.5; }
  50% { opacity: 0.9; }
  100% { opacity: 0.5; }
}

/* Meter */
.meter {
  position: relative;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle at center, #1e293b, #020617);
  box-shadow: 0 0 30px rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
}

/* Scale */
.scale div {
  position: absolute;
  width: 3px;
  height: 18px;
  background: #38bdf8;
  top: 10px;
  left: 50%;
  transform-origin: center 140px;
}

/* Needle */
.needle {
  position: absolute;
  width: 4px;
  height: 120px;
  background: #f43f5e;
  bottom: 50%;
  left: 50%;
  transform-origin: bottom center;
  transform: rotate(-90deg);
  box-shadow: 0 0 15px #f43f5e;
}

/* Center */
.center {
  position: absolute;
  width: 14px;
  height: 14px;
  background: #fff;
  border-radius: 50%;
}

/* Speed text */
.speed {
  position: absolute;
  bottom: 30px;
  font-size: 28px;
  font-weight: bold;
  color: #38bdf8;
}

- Speed Meter Animation

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