body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f0f0;
}

#app {
  width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

#login {
  text-align: center;
}

#login h1 {
  font-size: 24px;
  margin-bottom: 20px;
}

#login input {
  width: 250px;
  padding: 10px;
  margin-bottom: 10px;
  border: 1px solid #ccc;
  border-radius: 3px;
}

#login button {
  padding: 10px 20px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 3px;
  cursor: pointer;
}

#login a {
  text-decoration: none;
  color: #007bff;
  font-size: 12px;
  margin-top: 10px;
}

#chat {
  display: flex;
  flex-direction: column;
}

#chat-messages {
  flex: 1;
  overflow-y: scroll;
  padding: 10px;
}

.chat-message {
  margin-bottom: 10px;
  padding: 10px;
  background-color: #eee;
  border-radius: 3px;
}

.my-message {
  background-color: #cfc;
}

.username {
  font-weight: bold;
}

#chat-input {
  display: flex;
  align-items: center;
}

#chat-message-input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 3px;
}

#chat-send-button,
#logout-button {
  padding: 10px 20px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 3px;
  cursor: pointer;
  margin-left: 10px;
}