[class^="tooltip"] {
    position: relative;
}

[class^="tooltip"]:after {
    background: #999;
    border-radius: 2px;
    color: #fff;
    content: attr(data-tooltip);
    left: 50%;
    opacity: 0;
    padding: 6px 10px;
    position: absolute;
    top: 1.4em;
    transform: translateX(-50%) translateY(-2px);
    transition: opacity 0.2s cubic-bezier(0.64, 0.09, 0.08, 1), transform 0.2s cubic-bezier(0.64, 0.09, 0.08, 1);
    visibility: hidden;
    white-space: nowrap;
    z-index: 2;
}

[class^="tooltip"]:hover:after {
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    visibility: visible;
}

.tooltip--left:after {
    left: 0;
    top: -4px;
    transform: translateX(-112%) translateY(0);
}

.tooltip--left:hover:after {
    transform: translateX(-110%) translateY(0);
}

.tooltip--right:after {
    left: 100%;
    top: -4px;
    transform: translateX(12%) translateY(0);
}

.tooltip--right:hover:after {
    transform: translateX(10%) translateY(0);
}

.tooltip--triangle:before {
    border-bottom: 5px solid #999;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    content: "";
    height: 0;
    left: 50%;
    opacity: 0;
    position: absolute;
    top: 1.1em;
    transform: translateX(-50%) translateY(-2px);
    transition: opacity 0.2s cubic-bezier(0.64, 0.09, 0.08, 1), transform 0.2s cubic-bezier(0.64, 0.09, 0.08, 1);
    visibility: hidden;
    width: 0;
    z-index: 3;
}

.tooltip--triangle:hover:before {
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(0);
    visibility: visible;
}