Question: Create two types of grids; one has black border then another red; the grids border both are 1px.
1st: 4 columns as default (1/4 each); auto adjust to 2 columns when browser become 650px, then auto adjust to 1 column when browser become 375px.
2nd: 2 columns as default (1/3 and 2/3); auto adjust to 1 column when browser become 375px.
