Task #2251, Stage #3 - Mining Empire landing

Let’s add some styling.
header must have a background color of #E4ECEE.
The .container should have a maximum width of 1320px - we’ll modify it later for different displays.
.container must be horizontally centered - use margin for this.
We’ll also add a div.menu-block flex container to the header.
Use margin-left to align it to the right of the header.
Inside the div.menu-block add ul.main-menu with two li.nav-item.
Each list item must contain a.nav-item-link: the first with the text About app, the second with the text Learn with us.
The first one should lead to the #about block, and the second one should lead to the #learn block.

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