<style>
        .progress span {
            position: absolute;
            width: 300px;
            height: 20px;
            border: 2px solid red;
        }

        .progress span::after {
            content: '';
            position: absolute;
            width: 0;
            height: 100%;
            background-color: red;

        }

        .progress:hover span::after {
            width: 100%;
            transition: width 5s ease;
        }
    </style>
 <div class="progress">
        <span></span>
    </div>

3D旋转木马

 <style>
        body {
            perspective: 1000px;
        }

        ul {
            width: 400px;
            height: 400px;
            top: 200px;
            margin: 0 auto;
            position: relative;
            list-style: none;

            transform-style: preserve-3d;
            position: relative;
            background-image: url(./pig.jpg);
            animation: aaa 6s linear infinite;
        }

        ul:hover {
            animation-play-state: paused;
        }

        ul li {
            position: absolute;
        }

        ul li:nth-child(1) {
            transform: rotateY(0) translateZ(300px);
        }

        ul li:nth-child(2) {
            transform: rotateY(60deg) translateZ(300px);
        }

        ul li:nth-child(3) {
            transform: rotateY(120deg) translateZ(300px);
        }

        ul li:nth-child(4) {
            transform: rotateY(180deg) translateZ(300px);
        }

        ul li:nth-child(5) {
            transform: rotateY(240deg) translateZ(300px);
        }

        ul li:nth-child(6) {
            transform: rotateY(300deg) translateZ(300px);
        }

        @keyframes aaa {
            0% {
                transform: rotateY(0);
            }

            100% {
                transform: rotateY(300deg);
            }
        }
    </style>

 <ul>
        <li><img src="./dog.jpg" alt=""></li>
        <li><img src="./dog.jpg" alt=""></li>
        <li><img src="./dog.jpg" alt=""></li>
        <li><img src="./dog.jpg" alt=""></li>
        <li><img src="./dog.jpg" alt=""></li>
        <li><img src="./dog.jpg" alt=""></li>
    </ul>