.uni-body {
  display: flex;
  justify-content: center;
  background: #f5f5f5; /* nền ngoài */
}

uni-app {
    width: 100%;
    max-width: 750px;
    min-height: 100vh;
    background: #fff;
}

.lang-box {
  display: flex;
  gap: 10px;
}

button {
  padding: 10px 20px;
  border: 1px solid #ccc;
  border-radius: 20px;
}