.bi {
    width: 1em;
    height: 1em;
    vertical-align: -.125em;
    fill: currentcolor;
}

.bd-navbar {
    padding: .75rem 0;
    background-color: transparent;
    box-shadow: 0 0.5rem 1rem rgba(0,0,0,0.15),inset 0 -1px 0 rgba(255,255,255,0.15);
}