.imagetitle {
   font-family:Sans-Serif; 
     font-size:       15pt;
    text-align:       left; 
    position:relative;
}
.tooltip {
  display: none;
   font-family:Sans-Serif; 
     font-size:       15pt;
    text-align:       left;
}
    
.imagetitle:hover + .tooltip {
      display: block;
      float:left;
     width: 450px;
     background-color:#ffffcc;
     border:2px solid black;
     border-radius:10px;
    
  overflow: visible;
  position:absolute;
  z-index: 9999;
}