原文地址：https://segmentfault.com/a/1190000015484852

感想：monster中边框角、上下动画、旋转动画、左右动画，眼睛中transform:scaleY(n);

HTML code：

<!-- monster包含其body和eyes -->
<div class="monster">
    <span class="body"></span>
    <span class="eyes"></span>
</div>

CSS code：

html, body {
    margin: 0;
    padding: 0;
    height: 100vh;
    background-color: black;
}
/* 设置前景色 */
.monster{
    width: 100vw;
    height: 50vh;
    background-color: lightcyan;
}
/* 画出monster的body */
.monster{
    position: relative;
    overflow: hidden;
}
.body{
    position: absolute;
    left: -2vmin;
    bottom: calc(-1 * 32vmin / 2 - 4vmin);
    width: 32vmin;
    height: 32vmin;
    border-radius: 43% 40% 43% 40%;
    background-color: teal;
    /* 设置动画 */
    animation:
        bounce 1s infinite alternate,
        wave 3s linear infinite,
        wander 5s linear infinite alternate;
}
/* 身体上下跳的动画 */
@keyframes bounce{
    to{
        bottom: calc(-1 * 32vmin / 2 - 2vmin);
    }
}
/* 身体转动的动画 */
@keyframes wave {
    to {
        transform: rotate(360deg);
    }
}
/* monster左右移动*/
@keyframes wander {
    to {
        left: calc(100% - 32vmin + 2vmin);
    }
}
/* monster的eyes容器 */
.eyes{
    width: 24vmin;
    height: 5vmin;
    position: absolute;
    left: calc(32vmin - 24vmin - 2vmin);
    bottom: 2vmin;
    animation: wander 5s linear infinite alternate;
}
/* 用eyes的两个伪元素画出monster的eyes */
.eyes::before,
.eyes::after {
    content: '';
    position: absolute;
    box-sizing: border-box;
    width: 5vmin;
    height: 5vmin;
    border: 1.25vmin solid white;
    border-radius: 50%;
    /* 眼睛眨眼 */
    animation: blink 3s infinite linear;
}
@keyframes blink {
    4%, 10%, 34%, 40% {
        transform: scaleY(1);
    }
    7%, 37% {
        transform: scaleY(0);
    }
}
.eyes::before {
    left: 4vmin;
}
.eyes::after {
    right: 4vmin;
}