.grid_0 {

 width: 100%;

 margin-bottom: 15px;

 display: block;

}

​

.grid_1, .grid_2, .grid_3, .grid_3c, .grid_4, .grid_4c {

    margin-left : 1.00%;

    margin-right : 1.00%;

    margin-bottom : 15px;

    float : left;

    display : block;

    -webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */

    -moz-box-sizing: border-box;    /* Firefox, other Gecko */

    box-sizing: border-box;         /* Opera/IE 8+ */

}

​

.center{

    display: block;

    text-align: center;

    border:1px solid red;

}

​

.grid_1 { width: 98%; }

​

.grid_2 { width: 48%; float:none; border: 1px solid green;margin: 0 auto !important;}