​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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<style>
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    .box {
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        font-size: 5vw;
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        padding: 10vw;
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        border: solid;
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        background: linear-gradient(to bottom left, blue, yellow, red);
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    }
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</style>
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​
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<div class="box">This has a linear gradient.</div>