.grid{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    border: 5px solid black;
}
.grid-item{
    padding: 10px 0;
}

.grid-item1{
    background-color: red;
    grid-column-start: 3;
    grid-column-end: 4;
    grid-row-start: 2;
}
.grid-item2{
    background-color: rgb(93, 0, 255);
}
.grid-item3{
    background-color: rgb(0, 255, 21);
}