Any HTML element can be made into a grid container by setting its display property to grid.
In CSS Grid, the parent element is referred to as the container and its children are called items.
Final Code
<style>.d1{background:LightSkyBlue;}.d2{background:LightSalmon;}.d3{background:PaleTurquoise;}.d4{background:LightPink;}.d5{background:PaleGreen;}.container{font-size:40px;width:100%;background:LightGray;/* Only change code below this line */display:grid;/* Only change code above this line */}</style><divclass="container"><divclass="d1">1</div><divclass="d2">2</div><divclass="d3">3</div><divclass="d4">4</div><divclass="d5">5</div></div>