update _layout.scss
update _layout.scss

popu109/freshman21,heisaman/heisaman.xyz,heisaman/heisaman.xyz,heisaman/heisaman.xyz,benoitf/blog.sunix.org,sunix/blog.sunix.org,pktangyue/pktangyue.github.io,pktangyue/pktangyue.github.io,heisaman/heisaman.xyz,popu109/freshman21,sunix/blog.sunix.org,benoitf/blog.sunix.org