둥근 테두리
둥근 테두리를 추가하려면 w3 라운드 크기 클래스 중 하나를 추가하십시오 .

예
<div class="w3-panel w3-border">
  <p>My borders are normal.</p>
</div>

<div class="w3-panel w3-border w3-round-small">
  <p>My borders are rounded (small).</p>
</div>

<div class="w3-panel w3-border w3-round">
  <p>My borders are rounded.</p>
</div>

<div class="w3-panel w3-border w3-round-large">
  <p>I have large rounded borders.</p>
</div>

<div class="w3-panel w3-border w3-round-xlarge">
  <p>I have xlarge rounded borders.</p>
</div>

<div class="w3-panel w3-border w3-round-xxlarge">
  <p>I have xxlarge rounded borders.</p>
</div>