The repeat function can be used to create multiple grid rows/columns.
Final Code
<style>.item1{background:LightSkyBlue;}.item2{background:LightSalmon;}.item3{background:PaleTurquoise;}.item4{background:LightPink;}.item5{background:PaleGreen;}.container{font-size:40px;min-height:300px;width:100%;background:LightGray;display:grid;/* Only change code below this line */grid-template-columns:repeat(3,1fr);/* Only change code above this line */grid-template-rows:1fr1fr1fr;grid-gap:10px;}</style><divclass="container"><divclass="item1">1</div><divclass="item2">2</div><divclass="item3">3</div><divclass="item4">4</div><divclass="item5">5</div></div>