body {
  margin: 0;
  font-family: Arial, sans-serif;
  display: flex;
}
.sidebar {
  width: 250px;
  background: #2c3e50;
  color: #ecf0f1;
  min-height: 100vh;
  padding: 20px;
}
.sidebar .logo {
  width: 100%;
  margin-bottom: 20px;
}
.sidebar nav ul {
  list-style-type: none;
  padding: 0;
}
.sidebar nav ul li {
  margin: 10px 0;
}
.sidebar nav ul li a, .sidebar nav ul li button {
  color: #ecf0f1;
  text-decoration: none;
  display: block;
  padding: 8px;
  background: none;
  border: none;
  cursor: pointer;
}
main {
  padding: 20px;
  flex-grow: 1;
  background: #f4f4f4;
}
footer {
  padding: 10px;
  text-align: center;
  background: #ddd;
}
form label {
  display: block;
  margin-top: 10px;
}
form input, form textarea {
  width: 100%;
  padding: 8px;
  margin-top: 5px;
}