두꺼운 테두리

W3-topbar , W3-bottombar , W3-leftbar , 및 W3-rightbar 클래스는 요소에 두꺼운 테두리를 추가하는 데 사용됩니다 :

예
<div class="w3-panel w3-leftbar">
  <p>I have a thick left border.</p>
</div>

<div class="w3-panel w3-leftbar w3-border-blue">
  <p>I have a thick blue left border.</p>
</div>

<div class="w3-panel w3-leftbar w3-border-blue w3-pale-blue">
  <p>I have a thick blue left border and a pale-blue background color.</p>
</div>

<div class="w3-panel w3-topbar w3-bottombar w3-border-red w3-pale-red">
  <p>I have a thick red top and bottom border and a pale-red background color.</p>
</div>