body {
  margin: 0;
  font-family: Arial, sans-serif;
}

.sidebar {
  height: 100%;
  width: 200px;
  position: fixed;
  top: 0;
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  transition: 0.3s;
  padding-top: 20px;
}

.sidebar a {
  padding: 10px 15px;
  text-decoration: none;
  font-size: 18px;
  color: white;
  display: block;
}

.sidebar a:hover {
  background-color: #575757;
}

.logo {
  color: white;
  text-align: center;
  padding: 15px;
  font-size: 20px;
}

.content {
  margin-left: 200px;
  padding: 20px;
  transition: margin-left 0.3s;
}

button {
  padding: 10px 15px;
  cursor: pointer;
}

.closed {
  width: 0;
  padding-top: 0;
}