tooltipC.css

.tooltip {
    position: relative;
    display: inline-block;
  }
  
  .tooltip .tooltiptext {
    visibility: hidden;
    width: 140px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px;
    position: absolute;
    z-index: 1;
    bottom: 100%;
    left: 50%;
    margin-left: -75px;
    opacity: 0;
    transition: opacity 0.3s;
  }
  
  .tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
  }
  
  /* .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  } */

/* 
  .tooltip .tooltiptext {
    -webkit-opacity: 0.25;
    -moz-opacity: 0.25;
    opacity: 0.25;
  -webkit-transition: all 3s ease;
    -moz-transition: all 3s ease;
    -ms-transition: all 3s ease;
    -o-transition: all 3s ease;
    transition: all 3s ease;
  } */