Peer-to-peer code review [desktop version]

[JuanLPalacios]

an overall great work especially on the HTML structure but here are some points to improve:

• on the first section the background image is repeating and doesn't look great, I'd suggest the use of background-size: cover to prevent that.
• the CSS sometimes presents selectors with 4 jumps while some browsers only support 3
• the header is inside the first section but technically is not part of the first section, I'd suggest the use of position absolute for the header so that it does not push the section down and depending on if they are needed background: transparent or z-index as you see fit
• links could point to sections by their id