​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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<style>
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    div {
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        border-color: darkorange;
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        border-style: solid;
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        height: 4.5vh;
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        margin: 4vh;
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    }
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    .a {
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        border-width: thin;
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    }
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    .b {
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        border-width: medium;
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    }
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    .c {
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        border-width: thick;
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    }
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    .d {
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        border-width: 1px;
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    }
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    .e {
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        border-width: 1em;
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    }
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    .f {
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        border-width: 1pt;
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    }
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    .g {
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        border-width: 1vw;
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    }
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    .h {
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        border-width: 1vh;
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    }
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    .i {
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        border-width: 1px 2px 8px 20px;
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    }
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</style>
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​
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<div class="a"></div>
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<div class="b"></div>
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<div class="c"></div>
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<div class="d"></div>
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<div class="e"></div>
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<div class="f"></div>
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<div class="g"></div>
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<div class="h"></div>
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<div class="i"></div>