.csstooltip {
  position: relative;
  display: inline-block;
  border-bottom: 1px dotted black;
  cursor: help;
}

.csstooltip .csstooltiptext {
  visibility: hidden;
  width: 240px;
  background-color: #777;
  color: #fff;
  text-align: center;
  border-radius: 4px;
  padding: 5px 0;
  position: absolute;
  z-index: 1;
  top: 150%;
  left: 0%; /*50%*/
  margin-left: -60px;
  
  font-style: normal;
  font-weight: normal;
  font-size: 14px;
  opacity: .95;
}

.csstooltip .csstooltiptext::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  margin-left: -5px;
  border-width: 6px;
  border-style: solid;
  border-color: transparent transparent #777 transparent;
}

.csstooltip:hover .csstooltiptext {
  visibility: visible;
}

@media (max-width: 768px) {/* sm + */
  .csstooltip .csstooltiptext {
    left: 50%;
  }
  .csstooltip .csstooltiptext::before {
    left: 25%;
  }
}