<main>
  <p>CSS <strong><code>width</code></strong> 속성은 요소의 너비를 설정합니다.</p>
</main>

p {
  width: min-content;
  margin: 20px;
  background: tomato;
}

main {
  width: 400px;
  background: royalblue;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}