body {
  font-family: sans-serif;
  font-weight: 300;
}
img{
    display:block;
}
table, th, td {
    border: 1px solid black;
    padding:0;
    border-collapse:collapse;
}
.tooltip {
    position: relative;
  
  
}
.tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
   
   padding: 0px 0;
    border-radius: 0px;
    
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    
    opacity: 0;
    transition: opacity 1s;
  
}
.tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: 0px;
    border-width: 0px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
}
.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: .75;
 
}