Tooltip

[admin]

Add two classes to the visualization element that you want to have a tooltip: tooltip tooltip-1
Common tooltip class provides the tooltip element itself, while second class (tooltip-1) specifies the tooltip text

Custom CSS, adjust styles and text as needed:

Code:

.usermode .tooltip:before {
  display: none;
  position: absolute;
  top: -30px;
  height: 20px;
  line-height: 20px;
  left: 0;
  background-color: #eee;
  padding: 2px 6px;
  border-radius: 3px;
}
.usermode .tooltip:hover:before {
    display: block;
}
.usermode .tooltip-1:before {
  content: "My custom tooltip";
}