Necessary containers with CSS Grid - html

Question

One of the main selling points of the CSS grid is that it eliminates container DIVs.
But I found a very common layout in which this doesn't appear to be true.
This page is supposed to have 4 areas: header, side, main and footer. But notice that side and main have a different background, so how is this possible to achieve with CSS grid without creating a container element for side and main, and turning the grid into header, side+main, footer?

Answer 1

You need to think of this in terms of a 4-column grid...then assign your divs to the appropriate rows & columns.
The background can be managed by a pseudo-element on the body although I prefer a page containing div. Same effect.
Codepen Demo
Nore info: Breaking Out With CSS Grid Layout
.page {
display: grid;
min-height: 100vh;
grid-template-columns: 1fr 100px 300px 1fr;
grid-template-rows: min-content 1fr min-content;
grid-gap: .5em;
}
.page::before {
content: "";
grid-column: 1 / 5;
grid-row: 2 / 3;
z-index: -2;
background: pink;
}
header {
background: red;
padding: 1em 0
}
footer {
background: blue;
padding: 1em 0;
}
aside {
background: green;
}
main {
background: rebeccapurple;
}
header,
footer {
grid-column: 2 / 4;
}
aside {
grid-column: 2 / 3;
grid-row: 2;
}
main {
grid-column: 3 / 4;
grid-row: 2;
}
<div class="page">
<header>HEADER-CONTENT</header>
<aside></aside>
<main></main>
<footer>FOOTER CONTENT</footer>
</div>
In this case I substituted different widths for demo purposes...
grid-template-columns: 1fr 100px 300px 1fr;
for say
grid-template-columns: 1fr 300px 640px 1fr;
Where the total of 300px + 640px equates to your 940px "container" width. These can be adjusted as you prefer.