.r1, .r2, .r3 {
    display: block;
    height: 1px;
}

.r3 { margin: 0 3px; }
.r2 { margin: 0 2px; }
.r1 { margin: 0 1px; }

#rounded-box-3 .inner-box, #rounded-box-3  b {
    background-color: #CCC;
}

.inner-box {
    padding-left:3px;
    padding-right:3px;
}

.r1, .r2, .r3 {
    overflow: hidden; 
    font-size:1px;
}