.ct-tooltip {
    position: absolute;
    display: inline-block;
    min-width: 5em;
    padding: 8px 10px;
    background: #383838;
    color: #fff;
    text-align: center;
    pointer-events: none;
    z-index: 100;
    -webkit-transition: opacity .2s linear;
    -o-transition: opacity .2s linear;
    transition: opacity .2s linear;
}

.ct-tooltip:before {
    position: absolute;
    bottom: -14px;
    left: 50%;
    border: solid transparent;
    content: ' ';
    height: 0;
    width: 0;
    pointer-events: none;
    border-color: rgba(251, 249, 228, 0);
    border-top-color: #383838;
    border-width: 7px;
    margin-left: -8px;
}

.ct-tooltip.hide {
    display: block;
    opacity: 0;
    visibility: hidden;
}