added grid styling for the home page
added grid styling for the home page

CP3402-2017-1/a2-cp3402-2017-team13,CP3402-2017-1/a2-cp3402-2017-team13,CP3402-2017-1/a2-cp3402-2017-team13,CP3402-2017-1/a2-cp3402-2017-team13