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<div> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> </div>Centered display:
body { margin: 0; height: 100vh; display: flex; align-items: center; justify-content: center; background-color: black; }Define the container size:
.container { width: 30em; height: 30em; font-size: 10px; }Use grid layout to arrange the 9 sub-elements into a 3 * 3 grid:
.container { display: grid; grid-template-columns: repeat(3, 1fr); }Set the style of the sub-elements in the container through pseudo Elements are set:
.container span { position: relative; } .container span::before, .container span::after { content: ''; position: absolute; box-sizing: border-box; border-style: none solid solid none; border-width: 1em; border-color: gold; width: 100%; height: 100%; }Rotate the container so that its tip points upward:
.container { transform: rotate(-135deg); }Increase the animation of the size of the child element changing from small to large:
.container span::before, .container span::after { animation: animate-scale 1.6s linear infinite; } @keyframes animate-scale { from { width: 1%; height: 1%; } to { width: 100%; height: 100%; } }Add the child Animation for changing element border color:
.container span::before, .container span::after { animation: animate-border-color 1.6s linear infinite, animate-scale 1.6s linear infinite; } @keyframes animate-border-color { 0%, 25% { border-color: tomato; } 50%, 75% { border-color: gold; } 100% { border-color: black; } }Add animation for changing child element border width:
.container span::before, .container span::after { animation: animate-border-width 1.6s linear infinite, animate-border-color 1.6s linear infinite, animate-scale 1.6s linear infinite; }Finally, let
::after slow down the animation time of the pseudo element by half a beat :
.container span::after { animation-delay: -0.8s; } @keyframes animate-border-width { 0%, 100%{ border-width: 0.1em; } 25% { border-width: 1.5em; } }Done!
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