body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background-color: #f8f9fa;
}

.btn {
  background-color: #007bff;
  color: white;
  border: none;
  padding: 10px 20px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
}

.btn:hover {
  background-color: #0056b3;
}

.popover {
  position: absolute;
  background-color: white;
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-radius: 6px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  max-width: 280px;
}

.popover-header {
  background-color: #007bff;
  color: white;
  padding: 10px 14px;
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  border-radius: 5px 5px 0 0;
}

.popover-body {
  padding: 10px 14px;
  color: #212529;
  font-size: 14px;
}

.popover-arrow {
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-top: 10px solid rgba(0, 0, 0, 0.2);
}

.popover-arrow::after {
  content: '';
  position: absolute;
  bottom: 1px;
  left: -9px;
  width: 0;
  height: 0;
  border-left: 9px solid transparent;
  border-right: 9px solid transparent;
  border-top: 9px solid white;
}