.grid { position: relative; }
.grid:after { content: ''; display: block; clear: both; }
.grid .tile { float: left; display: block; min-height: 10px; }

.grid_w_8 .tile { position: relative; width: 12.5%; }
.grid_w_8 .tile.w_2 { width: 25%; }
.grid_w_8 .tile.w_3 { width: 37.5%; }
.grid_w_8 .tile.w_4 { width: 50%; }
.grid_w_8 .tile.w_5 { width: 62.5%; }
.grid_w_8 .tile.w_6 { width: 75%; }
.grid_w_8 .tile.w_7 { width: 87.5%; }
.grid_w_8 .tile.w_8 { float: none; width: 100%; clear: both; }