body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f1f1f1;
}

.login-box {
  max-width: 300px;
  margin: 100px auto;
  background: #fff;
  padding: 20px;
  text-align: center;
}

#chat {
  height: calc(100vh - 120px);
  overflow-y: auto;
  padding: 10px;
}

.me {
  text-align: right;
  background: #d1e7ff;
  margin: 5px;
  padding: 6px;
  border-radius: 6px;
}

.other {
  text-align: left;
  background: #fff;
  margin: 5px;
  padding: 6px;
  border-radius: 6px;
}

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