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

.hidden {
  display: none;
}

#chat_container {
  height: 300px;
  overflow-y: scroll;
  border: 1px solid #ccc;
  padding: 10px;
}

.message {
  background-color: #f2f2f2;
  padding: 10px;
  border-radius: 10px;
  margin-bottom: 10px;
}

#message_box {
  display: flex;
  align-items: center;
  margin-top: 10px;
}

#message_input {
  flex-grow: 1;
  padding: 10px;
  border: none;
  border-radius: 5px;
  margin-right: 10px;
}

#send_button {
  background-color: #4caf50;
  color: white;
  padding: 10px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.spinner {
  display: none;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 5px solid #fff;
  border-top-color: #1a1a1a;
  animation: spin 1s infinite linear;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}