Inset hr on Dark BG

by Charles Butler

HTML

<span class="hr"></span>

CSS

body {
    background: #333;
    padding:50px;
}
.hr {
    background: rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);

    -moz-box-shadow:inset 0 5px 5px -5px #000;
    -webkit-box-shadow:inset 0 5px 5px -5px #000;
    box-shadow:inset 0 5px 5px -5px #000;
    width: 100%;
    display: block;
}