CodePen Embed - Pure CSS Scroll shadow

Live

 
<div class="g-container">
    <ul class="g-one">
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
    </ul>
    <ul class="g-two">
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
    </ul>
    <ul class="g-combine">
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
    </ul>
    <ul class="g-final">
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
        <li>AAAAAAAA AAAA</li>
        <li>BBBBBBBB CCCC</li>
        <li>DDDDDDDD DDDD</li>
    </ul>
</div>
<div class="g-tips">
    <div>background-attachment: <span>local</span></div>
    <div>background-attachment: <span>scroll</span></div>
    <div>background-attachment: <span>local</span> + background-attachment: <span>scroll</span></div>
    <div></div>
</span>

Live

​x
 
body {
    padding: 20px;
}
.g-container {
    width: 100%;
    display: flex;
    justify-content: space-around;
}
​
li {
    line-height: 24px;
}
​
ul {
    position: relative;
    margin: auto;
    overflow: auto;
    height: 8em;
    padding: .3em .5em;
    border: 1px solid silver;
}
​
.g-one {
    background: linear-gradient(#fff, #f00);
    background-size: 100% 10px;
    background-repeat: no-repeat;
    background-attachment: local;
}
​
.g-two {
    background: radial-gradient(at 50% 0, #000, #0f0 72%);
    background-size: 100% 10px;
    background-repeat: no-repeat;
    background-attachment: scroll;
}
​
.g-combine {
    background: 
        linear-gradient(#fff, #f00),
        radial-gradient(at 50% 0%, #000, #0f0 72%);
    background-size: 100% 10px, 100% 10px;
    background-repeat: no-repeat;
    background-attachment: local, scroll;
}
​
.g-final {
    background: 
        linear-gradient(#fff, transparent 100%),
        linear-gradient(rgba(0, 0, 0, .5), transparent 100%);
    background-size: 100% 50px, 100% 10px;
    background-repeat: no-repeat;
    background-attachment: local, scroll;
}
​
​
.g-tips {
    margin-top: 24px;
    display: flex;
    justify-content: space-around;
    font-size: 14px;
    font-weight: bold;
    
    div {
        width: 250px;
        text-align: center;
    }
    
    span {
        color: deeppink;
    }
}

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