Modify on side margin (cosmetic)

change

#header {
margin: 0 1%;

into

#header {
margin: 0 0.5%;

change

h1.title {
padding-top: 38px;
margin: 0 1% .1em;

into

h1.title {
padding-top: 38px;
margin: 0 1% .1em;
#header .description {
display: block;
margin: 0 1%;

into

#header .description {
display: block;
margin: 0 0.5%;

change

#content-wrapper {
margin: 0 1%;

into

#content-wrapper {
margin: 0 0.5%;