巧用 CSS 实现酷炫的充电动画

<div class="container">
    <div class="header"></div>
    <div class="battery">
    </div>
    <div class="battery-copy">
        <div class="g-wave"></div>
        <div class="g-wave"></div>
        <div class="g-wave"></div>
    </div>
</div>

html,
body {
    width: 100%;
    height: 100%;
    display: flex;
    background: #e4e4e4;
}

.container {
    position: relative;
    width: 140px;
    margin: auto;
}

.header {
    position: absolute;
    width: 26px;
    height: 10px;
    left: 50%;
    top: 0;
    transform: translate(-50%, -10px);
    border-radius: 5px 5px 0 0;
    background: rgba(255, 255, 255, .88);
}

.battery-copy {
    position: absolute;
    top: 0;
    left: 0;
    height: 220px;
    width: 140px;
    border-radius: 15px 15px 5px 5px;
    overflow: hidden;
}

.battery {
    position: relative;
    height: 220px;
    box-sizing: border-box;
    border-radius: 15px 15px 5px 5px;
    box-shadow: 0 0 5px 2px rgba(255, 255, 255, 0.22);
    background: #fff;
    z-index: 1;
    
    &::after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        top: 80%;
        background: linear-gradient(to bottom, #7abcff 0%, #00BCD4 44%, #2196F3 100%);
        border-radius: 0px 0px 5px 5px;
        box-shadow: 0 14px 28px rgba(33, 150, 243, 0), 0 10px 10px rgba(9, 188, 215, 0.08);
        animation: charging 10s linear infinite;
        filter: hue-rotate(90deg);
    }
}

.g-wave {
    position: absolute;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, .8);
    border-radius: 45% 47% 44% 42%;
    bottom: 25px;
    left: 50%;
    transform: translate(-50%, 0);
    z-index: 1;
    animation: move 10s linear infinite;
}

.g-wave:nth-child(2) {
    border-radius: 38% 46% 43% 47%;
    transform: translate(-50%, 0) rotate(-135deg);
}

.g-wave:nth-child(3) {
    border-radius: 42% 46% 37% 40%;
    transform: translate(-50%, 0) rotate(135deg);
}

@keyframes charging {
    50% {
        box-shadow: 0 14px 28px rgba(0, 150, 136, 0.83), 0px 4px 10px rgba(9, 188, 215, 0.4);
    }
    
    95% {
        top: 5%;
        filter: hue-rotate(0deg);
        border-radius: 0 0 5px 5px;
        box-shadow: 0 14px 28px rgba(4, 188, 213, .2), 0 10px 10px rgba(9, 188, 215, 0.08);
    }
    100% {
        top: 0%;
        filter: hue-rotate(0deg);
        border-radius: 15px 15px 5px 5px;
        box-shadow: 0 14px 28px rgba(4, 188, 213, 0), 0 10px 10px rgba(9, 188, 215, 0.4);
    }
}

@keyframes move {
    100% {
        transform: translate(-50%, -160px) rotate(720deg);
    }
}

<div class="g-container">
    <div class="g-number">98.7%</div>
    <div class="g-contrast">
        <div class="g-circle"></div>
        <ul class="g-bubbles">
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</div>

html,
body {
    width: 100%;
    height: 100%;
    display: flex;
    background: #000;
    overflow: hidden;
}

.g-number {
    position: absolute;
    width: 300px;
    top: 27%;
    text-align: center;
    font-size: 32px;
    z-index: 10;
    color: #fff;
}

.g-container {
    position: relative;
    width: 300px;
    height: 400px;
    margin: auto;
}

.g-contrast {
    filter: contrast(15) hue-rotate(0);
    width: 300px;
    height: 400px;
    background-color: #000;
    overflow: hidden;
    animation: hueRotate 10s infinite linear;
}

.g-circle {
    position: relative;
    width: 300px;
    height: 300px;
    box-sizing: border-box;
    filter: blur(8px);
    
    &::after {
        content: "";
        position: absolute;
        top: 40%;
        left: 50%;
        transform: translate(-50%, -50%) rotate(0);
        width: 200px;
        height: 200px;
        background-color: lime;
        border-radius: 41% 52% 43% 56% / 42% 38% 58% 49%;
        animation: rotate 10s infinite linear;
    }
    
    &::before {
        content: "";
        position: absolute;
        width: 176px;
        height: 176px;
        top: 40%;
        left: 50%;
        transform: translate(-50%, -50%);
        border-radius: 50%;
        background-color: #000;
        z-index: 10;
    }
}

.g-bubbles {
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 100px;
    height: 40px;
    transform: translate(-50%, 0);
    border-radius: 100px 100px 0 0;
    background-color: lime;
    filter: blur(5px);
}

li {
    position: absolute;
    border-radius: 50%;
    background: lime;
}

@for $i from 0 through 15 { 
    li:nth-child(#{$i}) {
        $width: 15 + random(15) + px;
        $opacity: random(100);
        left: 15 + random(70) + px;
        top: 50%;
        transform: translate(-50%, -50%);
        width: $width;
        height: $width;
        animation: moveToTop #{random(6) + 3}s ease-in-out -#{random(5000)/1000}s infinite;
    }
}

@keyframes rotate {
    50% {
        border-radius: 42% 38% 58% 49% / 41% 52% 43% 56%;
    }
    100% {
        transform: translate(-50%, -50%) rotate(720deg);
    }
}

@keyframes moveToTop {
    90% {
        opacity: 1;
    }
    100% {
        opacity: .1;
        transform: translate(-50%, -180px);
    }
}

@keyframes hueRotate {
    100% {
        filter: contrast(15) hue-rotate(360deg);
    }
}