效果预览
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https://codepen.io/comehope/pen/EpbaQX
可交互视频
此视频是可以交互的，你可以随时暂停视频，编辑视频中的代码。
请用 chrome, safari, edge 打开观看。
https://scrimba.com/p/pEgDAM/cBdyeTw
源代码下载
本地下载每日前端实战系列的全部源代码请从 github 下载：
https://github.com/comehope/front-end-daily-challenges
代码解读
定义 dom，容器本身表示土星星球，其中的 ring 元素表示土星环：
<div class="saturn">
<span class="rings"></span>
</div>
居中显示：
body {
margin: 0;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
background-color: black;
}
定义容器尺寸：
.saturn {
width: 20em;
height: 20em;
font-size: 20px;
}
画出土星星球（此为草稿，后面还会细化）：
.saturn {
position: relative;
}
.saturn::before,
.saturn::after {
content: '';
position: absolute;
width: 9em;
height: 9em;
background: linear-gradient(
palegoldenrod 0%,
tan 10%,
burlywood 30%,
palegoldenrod 60%,
darkgray 100%
);
border-radius: 50%;
left: calc((20em - 9em) / 2);
top: calc((20em - 9em) / 2);
}
画出土星环（此为草稿，后面还会细化）：
.rings {
position: absolute;
width: inherit;
height: inherit;
background: radial-gradient(
transparent 35%,
dimgray 40%,
slategray 50%,
transparent 60%,
dimgray 60%,
slategray 70%,
transparent 70%
);
}
改变观察土星环的视角：
.rings {
transform: rotateX(75deg);
}
为了使土星呈现被土星环环绕的效果，把土星分为上下两半，使它们和土星环的图层顺序从底到顶依次为：星球的下半部、土星环、星球的上半部：
.saturn::before {
clip-path: inset(50% 0 0 0);
}
.saturn::after {
clip-path: inset(0 0 50% 0);
}
至此，画出了土星的整体结构，接下来完善细节。
为土星环涂上丰富的渐变色：
.rings {
background: radial-gradient(
rgba(24,19,25,0) 0%,
rgba(53,52,51,0) 34%,
rgba(55,54,52,1) 36%,
rgba(56,55,53,1) 37%,
rgba(68,67,66,1) 38%,
rgba(56,55,53,1) 39%,
rgba(68,67,66,1) 40%,
rgba(56,55,53,1) 41%,
rgba(87,77,76,1) 42%,
rgba(87,77,76,1) 44%,
rgba(113,110,103,1) 46%,
rgba(113,110,103,1) 48%,
rgba(113,98,93,1) 49%,
rgba(113,98,93,1) 51%,
rgba(122,115,105,1) 52%,
rgba(113,98,93,1) 53%,
rgba(113,98,93,1) 54%,
rgba(122,115,105,1) 55%,
rgba(106,99,89,1) 56%,
rgba(106,99,89,1) 58%,
rgba(79,76,76,0) 60%,
rgba(65,64,70,1) 61%,
rgba(65,64,70,1) 62%,
rgba(90,85,89,1) 63%,
rgba(78,74,73,1) 65%,
rgba(78,73,74,1) 67%,
rgba(78,73,74,0) 68%,
rgba(78,73,75,1) 69%,
rgba(78,73,75,1) 70%,
rgba(78,73,76,0) 71%,
rgba(77,72,76,0) 72%,
rgba(24,19,25,0) 100%
);
}
为星球涂上丰富的渐变色：
.saturn::before,
.saturn::after {
background:
linear-gradient(
rgba(212,203,174,1) 0%,
rgba(212,203,174,1) 10%,
rgba(221,203,157,1) 15%,
rgba(221,203,157,1) 17%,
rgba(213,181,143,1) 22%,
rgba(213,181,143,1) 26%,
rgba(208,180,158,1) 32%,
rgba(208,180,158,1) 36%,
rgba(218,188,162,1) 37%,
rgba(218,188,162,1) 39%,
rgba(211,184,157,1) 41%,
rgba(211,184,157,1) 49%,
rgba(205,186,156,1) 51%,
rgba(205,186,156,1) 52%,
rgba(202,176,153,1) 53%,
rgba(202,176,153,1) 65%,
rgba(190,177,145,1) 68%,
rgba(190,177,145,1) 80%,
rgba(150,144,130,1) 91%,
rgba(150,144,130,1) 95%,
rgba(131,129,117,1) 97%,
rgba(131,129,117,1) 100%
);
}
再为星球增加光照效果：
.saturn::before,
.saturn::after {
background:
radial-gradient(
circle at top,
transparent 40%,
black
),
radial-gradient(
transparent 62%,
black
),
linear-gradient(
rgba(212,203,174,1) 0%,
rgba(212,203,174,1) 10%,
rgba(221,203,157,1) 15%,
rgba(221,203,157,1) 17%,
rgba(213,181,143,1) 22%,
rgba(213,181,143,1) 26%,
rgba(208,180,158,1) 32%,
rgba(208,180,158,1) 36%,
rgba(218,188,162,1) 37%,
rgba(218,188,162,1) 39%,
rgba(211,184,157,1) 41%,
rgba(211,184,157,1) 49%,
rgba(205,186,156,1) 51%,
rgba(205,186,156,1) 52%,
rgba(202,176,153,1) 53%,
rgba(202,176,153,1) 65%,
rgba(190,177,145,1) 68%,
rgba(190,177,145,1) 80%,
rgba(150,144,130,1) 91%,
rgba(150,144,130,1) 95%,
rgba(131,129,117,1) 97%,
rgba(131,129,117,1) 100%
);
}
最后，把画面旋转一点角度：
.saturn {
transform: rotate(-15deg);
}
大功告成！
原文地址：https://segmentfault.com/a/1190000015798428
