Tooltips

A Tooltip is a small piece of contextual information about an element on the screen, which is displayed when a user hovers or focuses on the element it is describing. It is not focusable and cannot contain focusable content.

You can only change some settings and deployment details in a predefined activity.
Process resources is a default activity created by Aternity. You can only change deployment details of this activity. 
.tooltip{
    color: #fff;
    font-family: tableau_book;
    line-height: 16px;
    width: 200px;
    background: #555C5B;
    font-size: 12px;
    padding: 10px;
}