tried to fix large promo
created html and css files for header

added in basic html content and some css to style it
added in logo placeholder
resized the logo placeholder image
changed colour of header
created footers css and product-details css

as well, added some basic code into the footers.html
added some css to footers
linked product-details css to product-details html
made grid.css
changed code in header html
styled header sections (changed sizes)
changed header colour
added footer html
changed header background colour
changed footer colour
changed <h2> font colour
changed header and footer background colour
added html for product-details page
changed html for product-details
added css to product-details page