body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 250px;
  background-color: #2c3e50;
  color: white;
  display: flex;
  flex-direction: column;
  padding: 10px;
}

.sidebar-header {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.sidebar-module {
  margin-bottom: 10px;
  border: 1px solid #34495e;
  border-radius: 5px;
  overflow: hidden;
}

.module-header {
  width: 100%;
  text-align: left;
  background-color: #34495e;
  color: white;
  border: none;
  padding: 10px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.module-header:hover {
  background-color: #1abc9c;
}

.module-content {
  background-color: #ecf0f1;
  color: #2c3e50;
  padding: 10px;
  display: none;
  border-top: 1px solid #bdc3c7;
}