css grid example

.gridded {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 18px;
    grid-row-gap: 20px;
}
.gridded > div {
        text-align:center;
        float:left; /* ignored in grid, but to support older browsers! */
}.item-a {
  grid-area: header;
}
.item-b {
  grid-area: main;
}
.item-c {
  grid-area: sidebar;
}
.item-d {
  grid-area: footer;
}

.container {
  display: grid;
  grid-template-columns: 50px 50px 50px 50px;
  grid-template-rows: auto;
  grid-template-areas: 
    "header header header header"
    "main main . sidebar"
    "footer footer footer footer";
}