"2019-09-21_CSS增加圖片遮罩"
Bootstrap 4.1.1 Snippet by john8895

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="pic">
<img src="https://picsum.photos/600/600/?random=1">
</div>
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.pic {
position: relative;
width: 600px;
height: 600px;
}
.pic::after {
content: '';
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: rgba(0, 0, 0, 0.5)
/* background: linear-gradient(90deg,rgba(255, 255, 255, 0.5),rgba(255, 255, 255, 1) 75%); */
}
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