glass border

HTML

<div class="glass_border"><div><div></div>

CSS

body {
    background-image: url('http://images2.layoutsparks.com/1/147691/aurora-colorful-bright-illuminance-31000.jpg');
}

.glass_border {
    margin: 1em;
    height: 10em;
    width: 15em;
    box-shadow: .1em .1em .2em rgba(0, 0, 0, .2);
    border-radius: .3em;
    border: .4em solid rgba(255, 255, 255, .1);
}
.glass_border > div {
    height: 100%;
    background: #f0edcc;
    box-shadow: inset 0 0 1px black;
}