<div class="kapsayici">
  <div>1</div>
  <div>2</div>
  <div>3</div>
  <div>4</div>
  <div>5</div>
  <div>6</div>
  <div>7</div>
  <div>8</div>
  <div>9</div>
  <div>10</div>
  <div>11</div>
  <div>12</div>
</div>
.kapsayici {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-gap: 10px;
  height: 100%;
}

.kapsayici div {
  background: lightblue;
}

html {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-size: 16px;
  text-align: center;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.