#wrapper {
 margin-top: 8%;
 width: 600px;
 margin-left: auto;
 margin-right: auto;
}

#how {
 float: left;
 width: 25%;
}

#where {
 float: left;
 width: 25%;
}

#when {
 float: left;
 width: 25%;
}

#why {
 width: 25%;
 overflow: hidden;
}