.gantt-card-wrapper {
  background: white;
  border: 1px solid #ddd;
  border-radius: 5px;
  margin: 1rem 0;
  padding: 1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.gantt-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 1px solid #eee;
  padding-bottom: 0.5rem;
}

.gantt-card-header h3 {
  margin: 0;
  color: #333;
}

.close-button {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #666;
  padding: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-button:hover {
  background-color: #f0f0f0;
  color: #333;
}

.gantt-card-content {
  max-height: 400px;
  overflow-y: auto;
}