header
general setup
html, body {
margin: 0;
padding: 0;}
body {
width: 80%;
max-width: 1280px;
margin: 0 auto;}
main, header, article, aside, footer, section {
padding: 1%;
header layout
header {
display: flex;
h1 {
flex: 1;}
header img {
height: 60px;}