.wrapper {
display:grid;
grid-gap:10px;
grid-template-columns:100px 100px 100px;
grid-template-rows:100px 100px 100px;
}
.wrapper div {
background:#999;
}
.item1 {
grid-column:1/3;
}
.item3 {
grid-row:2/4;
}
.item4 {
grid-column:2/4;
}
九宫格有4*4条线组成,因此子元素的值为1~4