body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #121212;
  color: #fff;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background: #00ffd5;
  color: #121212;
  padding: 15px;
  text-align: center;
  font-size: 1.5em;
  font-weight: bold;
}

main#chatWindow {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

footer {
  display: flex;
  padding: 10px;
  background: #1e1e2e;
}

input#messageInput {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 6px;
  background: #2e2e42;
  color: #fff;
}

button {
  background: #00ffd5;
  border: none;
  padding: 10px 20px;
  margin-left: 10px;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
}

.message {
  max-width: 60%;
  padding: 10px;
  border-radius: 10px;
  background: #2e2e42;
  align-self: flex-end;
}

.message.received {
  background: #444;
  align-self: flex-start;
}