Create a simple web page with a 'Holy Grail Layout' that includes a header, footer, and three columns. The layout should meet the following requirements:
Header:
Stretches horizontally across the whole page.
60px tall.
Background color: #ccc.
Columns:
The left column contains navigation items.
The middle column contains the page contents.
The right column contains ads.
Both the left and right columns have a fixed width of 100px.
The center column is fluid-width.
All the columns should have the same height, regardless of which column is the tallest.
Left column background color: #ffd700.
Center column background color: #87cefa.
Right column background color: #adff2f.
Footer:
Stretches horizontally across the whole page.
100px tall.
Background color: #ccc.
The footer should be at the bottom of the page even if there is not enough content to fill up the viewport height.