CodePen Embed - 使用 MASK 的基本使用

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html, body {
    width: 100%;
    height: 100%;
    display: flex;
}
​
​
div {
    margin: auto;
    position: relative;
    width: 25vw;
    height: 50vh;
    background: url(https://i.pinimg.com/originals/e8/ba/25/e8ba252917952f23dfc9715e942e654e.jpg) no-repeat;
    background-size: cover;
    mask: linear-gradient(90deg, transparent, #000);
}
​

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