示例：
https://code.juejin.cn/pen/7277764394618978365
html
<div class="pl"><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__dot"></div><div class="pl__text">Loading…</div>
</div>css
:root {--bg: #454954;--fg: #e3e4e8;--fg-t: rgba(227, 228, 232, 0.5);--primary1: #255ff4;--primary2: #5583f6;--trans-dur: 0.3s;font-size: calc(16px + (20 - 16) * (100vw - 320px) / (1280 - 320));
}body {background-color: var(--bg);background-image: linear-gradient(135deg, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.2));color: var(--fg);font: 1em/1.5 "Varela Round", Helvetica, sans-serif;height: 100vh;min-height: 360px;display: grid;place-items: center;transition: background-color var(--trans-dur), color var(--trans-dur);
}.pl {box-shadow: 2em 0 2em rgba(0, 0, 0, 0.2) inset, -2em 0 2em rgba(255, 255, 255, 0.1) inset;display: flex;justify-content: center;align-items: center;position: relative;letter-spacing: 0.1em;text-transform: uppercase;transform: rotateX(30deg) rotateZ(45deg);width: 15em;height: 15em;
}
.pl, .pl__dot {border-radius: 50%;
}
.pl__dot {animation-name: shadow;box-shadow: 0.1em 0.1em 0 0.1em black, 0.3em 0 0.3em rgba(0, 0, 0, 0.5);top: calc(50% - 0.75em);left: calc(50% - 0.75em);width: 1.5em;height: 1.5em;
}
.pl__dot, .pl__dot:before, .pl__dot:after {animation-duration: 2s;animation-iteration-count: infinite;position: absolute;
}
.pl__dot:before, .pl__dot:after {content: "";display: block;left: 0;width: inherit;transition: background-color var(--trans-dur);
}
.pl__dot:before {animation-name: pushInOut1;background-color: var(--bg);border-radius: inherit;box-shadow: 0.05em 0 0.1em rgba(255, 255, 255, 0.2) inset;height: inherit;z-index: 1;
}
.pl__dot:after {animation-name: pushInOut2;background-color: var(--primary1);border-radius: 0.75em;box-shadow: 0.1em 0.3em 0.2em rgba(255, 255, 255, 0.4) inset, 0 -0.4em 0.2em #2e3138 inset, 0 -1em 0.25em rgba(0, 0, 0, 0.3) inset;bottom: 0;clip-path: polygon(0 75%, 100% 75%, 100% 100%, 0 100%);height: 3em;transform: rotate(-45deg);transform-origin: 50% 2.25em;
}
.pl__dot:nth-child(1) {transform: rotate(0deg) translateX(5em) rotate(0deg);z-index: 5;
}
.pl__dot:nth-child(1), .pl__dot:nth-child(1):before, .pl__dot:nth-child(1):after {animation-delay: 0s;
}
.pl__dot:nth-child(2) {transform: rotate(-30deg) translateX(5em) rotate(30deg);z-index: 4;
}
.pl__dot:nth-child(2), .pl__dot:nth-child(2):before, .pl__dot:nth-child(2):after {animation-delay: -0.1666666667s;
}
.pl__dot:nth-child(3) {transform: rotate(-60deg) translateX(5em) rotate(60deg);z-index: 3;
}
.pl__dot:nth-child(3), .pl__dot:nth-child(3):before, .pl__dot:nth-child(3):after {animation-delay: -0.3333333333s;
}
.pl__dot:nth-child(4) {transform: rotate(-90deg) translateX(5em) rotate(90deg);z-index: 2;
}
.pl__dot:nth-child(4), .pl__dot:nth-child(4):before, .pl__dot:nth-child(4):after {animation-delay: -0.5s;
}
.pl__dot:nth-child(5) {transform: rotate(-120deg) translateX(5em) rotate(120deg);z-index: 1;
}
.pl__dot:nth-child(5), .pl__dot:nth-child(5):before, .pl__dot:nth-child(5):after {animation-delay: -0.6666666667s;
}
.pl__dot:nth-child(6) {transform: rotate(-150deg) translateX(5em) rotate(150deg);z-index: 1;
}
.pl__dot:nth-child(6), .pl__dot:nth-child(6):before, .pl__dot:nth-child(6):after {animation-delay: -0.8333333333s;
}
.pl__dot:nth-child(7) {transform: rotate(-180deg) translateX(5em) rotate(180deg);z-index: 2;
}
.pl__dot:nth-child(7), .pl__dot:nth-child(7):before, .pl__dot:nth-child(7):after {animation-delay: -1s;
}
.pl__dot:nth-child(8) {transform: rotate(-210deg) translateX(5em) rotate(210deg);z-index: 3;
}
.pl__dot:nth-child(8), .pl__dot:nth-child(8):before, .pl__dot:nth-child(8):after {animation-delay: -1.1666666667s;
}
.pl__dot:nth-child(9) {transform: rotate(-240deg) translateX(5em) rotate(240deg);z-index: 4;
}
.pl__dot:nth-child(9), .pl__dot:nth-child(9):before, .pl__dot:nth-child(9):after {animation-delay: -1.3333333333s;
}
.pl__dot:nth-child(10) {transform: rotate(-270deg) translateX(5em) rotate(270deg);z-index: 5;
}
.pl__dot:nth-child(10), .pl__dot:nth-child(10):before, .pl__dot:nth-child(10):after {animation-delay: -1.5s;
}
.pl__dot:nth-child(11) {transform: rotate(-300deg) translateX(5em) rotate(300deg);z-index: 6;
}
.pl__dot:nth-child(11), .pl__dot:nth-child(11):before, .pl__dot:nth-child(11):after {animation-delay: -1.6666666667s;
}
.pl__dot:nth-child(12) {transform: rotate(-330deg) translateX(5em) rotate(330deg);z-index: 6;
}
.pl__dot:nth-child(12), .pl__dot:nth-child(12):before, .pl__dot:nth-child(12):after {animation-delay: -1.8333333333s;
}
.pl__text {font-size: 0.75em;max-width: 5rem;position: relative;text-shadow: 0 0 0.1em var(--fg-t);transform: rotateZ(-45deg);
}/* Animations */
@keyframes shadow {from {animation-timing-function: ease-in;box-shadow: 0.1em 0.1em 0 0.1em black, 0.3em 0 0.3em rgba(0, 0, 0, 0.3);}25% {animation-timing-function: ease-out;box-shadow: 0.1em 0.1em 0 0.1em black, 0.8em 0 0.8em rgba(0, 0, 0, 0.5);}50%, to {box-shadow: 0.1em 0.1em 0 0.1em black, 0.3em 0 0.3em rgba(0, 0, 0, 0.3);}
}
@keyframes pushInOut1 {from {animation-timing-function: ease-in;background-color: var(--bg);transform: translate(0, 0);}25% {animation-timing-function: ease-out;background-color: var(--primary2);transform: translate(-71%, -71%);}50%, to {background-color: var(--bg);transform: translate(0, 0);}
}
@keyframes pushInOut2 {from {animation-timing-function: ease-in;background-color: var(--bg);clip-path: polygon(0 75%, 100% 75%, 100% 100%, 0 100%);}25% {animation-timing-function: ease-out;background-color: var(--primary1);clip-path: polygon(0 25%, 100% 25%, 100% 100%, 0 100%);}50%, to {background-color: var(--bg);clip-path: polygon(0 75%, 100% 75%, 100% 100%, 0 100%);}
}
