.tooltip {
    position: relative;
}
  
.tooltip .tooltiptext {
    opacity: 0;
    display: none;
    border-radius: 6px;
    top: -35px;
    transition-property: all;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: 150ms;

    /* Position the tooltip */
    position: absolute;
    z-index: 100;
}

.tooltip:hover .tooltiptext {
    display: inline;
    opacity: 1;
}