Cosi?
codice:
body{
background-color: gray;
color: #000;
font-family: Verdana, Tahoma, Arial, Trebuchet MS, Sans-Serif, Georgia, Courier, Times New Roman, Serif;
font-size: 11px;
margin: 0px;
padding: 0px;
text-align:center;
}
#wrap{
background-color: #CCC;
width: 90%;
margin: 10px auto 10px auto;
text-align:left;
}
.box-container,.box-container-space{
border: 1px solid #000;
background-color: #FFF;
height: 300px;
}
.box-container{
padding: 5px;
}
.box-yellow{
width: 49%;
background-color: yellow;
float: left;
}
.box-green{
background-color: green;
margin-left:51%;
}
.box-blue{
background-color: blue;
width: 49%;
float: left;
}
.box-red{
background-color: red;
margin-left:51%;
}
br{
clear:both;
}