<div class="wrapper">
  <p lang="ja" class="text">こんにちは</p>
  <p lang="en" class="text">Hello</p>
</div>

.wrapper {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
.text {
  + .text {
    margin-top: 2rem;
  }
  &:lang(ja) {
    color: red;
  }
  &:lang(en) {
    color: blue;
  }
}