​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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<style>
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    body {
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        background-image: url('/pix/samples/bg2.png');
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    }
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    .box {
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        opacity: .5;
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        background-color: orange;
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        font-size: 5vw;
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        padding: 10vw;
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        margin: 5vw;
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        border: solid;
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    }
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</style>
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​
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<div class="box">This box is half transparent.</div>