microsoftexcel/extensions-builtin/canvas-zoom-and-pan/style.css

.canvas-tooltip-info {
  position: absolute;
  top: 10px;
  left: 10px;
  cursor: help;
  background-color: rgba(0, 0, 0, 0.3);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column; 

  z-index: 100;
}

.canvas-tooltip-info::after {
  content: '';
  display: block;
  width: 2px;
  height: 7px;
  background-color: white;
  margin-top: 2px; 
}

.canvas-tooltip-info::before {
  content: '';
  display: block;
  width: 2px;
  height: 2px;
  background-color: white;
}

.canvas-tooltip-content {
  display: none;
  background-color: #f9f9f9; 
  color: #333; 
  border: 1px solid #ddd;
  padding: 15px; 
  position: absolute;
  top: 40px;
  left: 10px;
  width: 250px;
  font-size: 16px;
  opacity: 0;
  border-radius: 8px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2); 

  z-index: 100;
}

.canvas-tooltip:hover .canvas-tooltip-content {
  display: block;
  animation: fadeIn 0.5s; 
  opacity: 1;
}

@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}