SOURCE

<div class="wrapper">
  <div class="one item">One</div>
  <div class="two item">Two</div>
  <div class="three item">Three</div>
  <div class="four item">Four</div>
  <div class="five item">Five</div>
  <div class="six item">Six</div>
</div>

.wrapper {
  margin: 60px;
  /* 声明一个容器 */
  display: grid;
  /*  声明列的宽度  */
  /**/
  /* grid-template-columns: repeat(3, 200px); */
  /*grid-template-columns: 200px 100px 200px;*/
  /*grid-template-columns: repeat(auto-fill, 100px);*/
  /*grid-template-columns: 100px 1fr 2fr;*/
  /*grid-template-columns: 1fr 1fr minmax(200px,2fr);*/
  grid-template-columns: 100px auto 100px;
  /*  声明行间距和列间距  */
  /*grid-gap: 20px;*/
  grid-column-gap:20px;
  grid-row-gap:15px;
  /*  声明行的高度  */
  grid-template-rows: 100px 200px;
}
.one {
  background: #19CAAD;
}
.two { 
  background: #8CC7B5;
}
.three {
  background: #D1BA74;
}
.four {
  background: #BEE7E9;
}
.five {
  background: #E6CEAC;
}
.six {
  background: #ECAD9E;
}
.item {
  text-align: center;
  font-size: 200%;
  color: #fff;
}