The Holy Grail layout is a famous CSS page layout that consists of a header, footer, and three columns:

• The left column contains navigation items
• The middle column contains the main content
• The right column contains ads

Requirements:

1. Header
   • Stretches horizontally across the whole page
   • Height: 60px
2. Columns
   • Left and right columns have a fixed width of 100px
   • Center column is fluid-width
   • All columns should have equal height regardless of content
3. Footer
   • Stretches horizontally across the whole page
   • Height: 100px
   • Should stick to the bottom of the page even if content is short
4. Use only CSS for layout.