所以在过去的几天里，我第一次尝试使用 SVG。
我一直在尝试制作一个响应式面具，但没有成功。
我知道对此有很多问题和答案，但在我的情况下似乎没有一个。
有人可以给我一个提示我错过了什么吗？
html {
background: url(https://i.picsum.photos/id/10/800/800.jpg) no-repeat center center fixed;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
background-size: cover;
}
body {
margin: 0;
padding: 0;
overflow: hidden;
}
svg {
width: 100vw;
height: 100vh;
}
.alpha {
fill: #bbb;
}
.base {
fill: white;
mask: url(#mask);
}
.svg-container {
width: 100%;
}<div class="svg-container">
<svg viewBox="0 0 100% 100%" preserveAspectRatio="xMinYMin meet">
<defs>
<mask id="mask">
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