body {
  font-family: Arial, sans-serif;
  text-align: center;
  background-color: #f4f4f9;
}

h1 {
  color: #333;
  margin-bottom: 20px;
}

#chart-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 600px;
}

svg {
  background-color: #fff;
  border: 1px solid #ccc;
}

.tooltip {
  position: absolute;
  background-color: #333;
  color: #fff;
  padding: 5px;
  border-radius: 4px;
  pointer-events: none;
  font-size: 12px;
}

.side-panel {
  position: fixed;
  top: 20%;
  right: 0;
  width: 200px;
  padding: 10px;
  background-color: #f4f4f9;
  border-left: 1px solid #ccc;
  display: none;
}

.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
  background-color: #fff;
  margin: 15% auto;
  padding: 20px;
  border: 1px solid #888;
  width: 50%;
  position: relative;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}