span.top-nav-welcome-msg {
    margin-left: 15px;
    line-height: 40px;
    font-weight: bold;
    color: rgba(0, 0, 0, 0.6);
}

.hidden-xs.top-nav-welcome-msg {
    position: fixed;
}

.visible-xs.top-nav-welcome-msg {
    line-height: 37px;
    font-weight: bold;
    color: white;
}