flex, flex , flex

main { padding: 10px 10px 10px 10px; padding: 1%; }

1.You are giving 2 padding attributes. If all paddigns are 10px, just write it down once.

2.When you are doing same attribute to more classes like display:flex, for example, you could just do it like this: .post-block, .post-section, .introductory-section, main , body { display: flex } So instead writing it in 5 lines, in 5 different classes, you write it down in single line.

Nice project, keep coding =)