CodePen Embed - WNZwzBX

<div class="container">
  <div>first</div>
  <div>second</div>
  <div>third</div>  
</div>

.container {
  width: 1200px;
  grid-template-columns: 100px 100px 100px 100px 100px 100px 100px 100px 100px 100px 100px 100px;
}

.container {
  width: 1200px;
  grid-template-columns: repeat(12, 100px);
}

<button id="button1" onclick="button1_click();">버튼1</button>
<script>
function button1_click() {
  alert("버튼1을 누르셨습니다.");
}
</script>

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