.parentCell{
    position: relative;
}
.course-tooltip{
  display: none;
position: absolute;
z-index: 100;
border: 1px;
background-color: #000;
border: 1px solid #000;
padding: 3px;
color: #ffffff;
right: -80px;
opacity: 0 !important;
bottom: 0;
border-radius: 4px;
}
.parentCell:hover span.course-tooltip{
    display:block;
    opacity: 1 !important;

}