body {
  font-family: 'Arial', sans-serif;
  background: #f0f2f5;
  margin: 0;
  padding: 0;
  text-align: center;
}

.page {
  margin-top: 40px;
}

input {
  margin: 8px;
  padding: 8px;
  width: 200px;
}

button {
  padding: 8px 16px;
  margin: 6px;
  cursor: pointer;
}

.hidden {
  display: none;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  background: #333;
  height: 100vh;
  width: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20px;
}

.sidebar button {
  width: 130px;
  margin-bottom: 12px;
  background-color: #444;
  color: white;
  border: none;
}

.content {
  margin-left: 180px;
  padding: 20px;
  text-align: left;
}

.section {
  margin-top: 20px;
}