Traffic Light - CSS đèn xanh đỏ

Chia sẻ

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1. HTML

<div class="traffic-light">
		<div class="protector"></div>
		<div class="protector"></div>
		<div class="protector"></div>
		<div class="light-red"></div>
		<div class="light-yellow"></div>
		<div class="light-green"></div>
	</div>

2. CSS

body {
			margin: 0px;
			background: #fca701;
			display: flex;
			align-items: center;
			justify-content: center;
			height: 100vh;
		}

		.traffic-light {
			position: relative;
			background: #222;
			border-radius: 10px;
			padding: 16px;
			box-shadow: inset 0 0 0px 5px #2a2a2a;
		}

		.light-red,
		.light-yellow,
		.light-green {
			position: relative;
			margin: 16px;
			width: 100px;
			height: 100px;
			border-radius: 50%;
			background: repeating-linear-gradient(#333, #443 5px);
			animation-duration: 4s;
			animation-iteration-count: infinite;
			animation-timing-function: step-end;
		}

		.light-red {
			animation-name: lightUpRed;
		}

		.light-yellow {
			animation-name: lightUpYellow;
		}

		.light-green {
			animation-name: lightUpGreen;
		}

		@keyframes lightUpRed {
			0% {
				background: repeating-linear-gradient(#f00, #e00 5px);
				box-shadow: 0 0 40px #f00;
				z-index: 1;
			}
			35% {
				background: repeating-linear-gradient(#443, #333 5px);
				box-shadow: none;
				z-index: 0;
			}
		}

		@keyframes lightUpYellow {
			80% {
				background: repeating-linear-gradient(#fd0, #ec0 5px);
				box-shadow: 0 0 40px #fd0;
				z-index: 1;
			}
		}

		@keyframes lightUpGreen {
			35% {
				background: repeating-linear-gradient(#0d0, #0c0 5px);
				box-shadow: 0 0 40px #0d0;
				z-index: 1;
			}
			80% {
				background: repeating-linear-gradient(#443, #333 5px);
				box-shadow: none;
				z-index: 0;
			}
		}

		.protector {
			width: 100%;
			position: absolute;
			top: 25px;
			left: 50%;
			transform: translateX(-50%);
			border-right: solid 30px transparent;
			border-left: solid 30px transparent;
			border-top: solid 100px #191919;
			border-radius: 11px;
			z-index: -1;
		}

		.protector:nth-child(2) {
			top: 142px;
		}

		.protector:nth-child(3) {
			top: 257px;
		}

3. JAVASCRIPT

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