body {
  font-family: Arial, sans-serif;
  padding: 20px;
  background-color: #f3f3f3;
}

nav {
  margin-bottom: 20px;
}

button {
  margin-right: 10px;
  padding: 10px 16px;
  font-size: 16px;
  cursor: pointer;
}

#main-content {
  background-color: white;
  padding: 20px;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.dashboard-placeholder {
  border: 2px dashed #ccc;
  padding: 16px;
  background: #fafafa;
  margin-top: 20px;
}