.box{
    margin:10px;
    border: 1px solid #eee;
    font-family: arial;
    font-size: 12px;
    width: 740px;
}
.box div{ padding:5px; }
.box div:nth-child(odd)         { background-color:#fff; }
.box div:nth-child(even)                { background-color:#eee; }