.tooltip.top {
    padding: 5px 0;
}
.tooltip.in {
    filter: alpha(opacity=90);
    opacity: .9;
}

.tooltip.top .tooltip-arrow {
    bottom: 0;
    left: 50%;
    margin-left: -5px;
    border-width: 5px 5px 0;
    border-top-color: #000;
}
.tooltip-arrow {
    position: absolute;
    width: 0;
    height: 0;
    border-color: transparent;
    border-style: solid;
}