body {
  margin: 0;
  font-family: 'Arial', sans-serif;
  background: #0a3324;
  color: #fff;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

header {
  background: #0f4a2b;
}

.header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

select {
  padding: 0.5rem;
  font-size: 1rem;
  border-radius: 0.25rem;
}

main {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

footer {
  background: #083a2c;
  position: sticky;
  bottom: 0;
}

.message-input-bar {
  padding: 0.5rem;
  display: flex;
  justify-content: center;
}

#messageForm {
  display: flex;
  gap: 0.5rem;
  width: 100%;
  max-width: 600px;
}

#messageInput {
  flex: 1;
  padding: 0.75rem;
  font-size: 1rem;
  border: none;
  border-radius: 0.25rem 0 0 0.25rem;
}

button[type="submit"] {
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: none;
  background-color: #2ecc71;
  color: white;
  border-radius: 0 0.25rem 0.25rem 0;
  cursor: pointer;
}