Update grid_prestashop.css


Hi you have more grids with the wrong size.

Please check this code.

.container_9 .grid_1 {width:92px;}
.container_9 .grid_2 {width:202px;}
.container_9 .grid_3 {width:314px;}
.container_9 .grid_4 {width:424px;}
.container_9 .grid_5 {width:536px;}
.container_9 .grid_6 {width:646px;}
.container_9 .grid_7 {width:758px;}
.container_9 .grid_8 {width:868px;}
.container_9 .grid_9 {width:980px;}

All the sizes asociations have to be a 980px result

Ex.
grid_1 + grid_8 = 980
grid_2 + grid_7 = 980
grid_3 + grid_6 = 980
grid_4 + grid_5 = 980

please fix for all users, best regards!!