body {
  margin: 0;
  font-family: Arial;
  background: #111;
  color: white;
}

.center {
  text-align: center;
  margin-top: 20%;
}

input {
  padding: 10px;
  margin: 5px;
}

button {
  padding: 10px;
  margin: 5px;
  cursor: pointer;
}

.sidebar {
  width: 250px;
  height: 100vh;
  background: #1e1e1e;
  float: left;
  padding: 10px;
}

.chat {
  margin-left: 250px;
  padding: 10px;
}

#messages {
  height: 60vh;
  overflow-y: auto;
  background: #222;
  padding: 10px;
  margin-bottom: 10px;
}