.grid_5,
.grid_7,
.grid_12 {
  display: inline;
  float: left;
  margin-left: 10px;
  margin-right: 10px;
}

.grid_5 {width: 380px;}
.grid_7 {width: 540px;}
.grid_12 {width: 940px;}

.alpha {margin-left: 0;}
.omega {margin-right: 0;}

.top-row {width:940px; margin:20px 0 20px 0;}