kpov_judge/web/kpov_judge/static/style.css


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.hover {
    position:relative;
}

.tooltip { /* hide and position tooltip */
  top:1em;
  left:1em;
  background-color:black;
  color:white;
  border-radius:5px;
  opacity:0;
  position:absolute;
  -webkit-transition: opacity 0.5s;
  -moz-transition: opacity 0.5s;
  -ms-transition: opacity 0.5s;
  -o-transition: opacity 0.5s;
  transition: opacity 0.5s;
}

.hover:hover .tooltip { /* display tooltip on hover */
    opacity:1;
}