fieldset.Ocean div.create pre:hover {
    background-color:red;
}

fieldset.River {
    float:left;
}
fieldset.Target div.output div.item:hover {
    background-color:lightgreen;
}
fieldset.Source div.output {
    padding:0;
}
fieldset.Action div.output div.item:hover {
    background-color:lightblue;
}
fieldset.Storm {
    float:right;
}

fieldset.Steam table.device {
    padding:10px;
    border:solid 1px green;
    margin-left:10px;
    float:left;
}
fieldset.Steam div.create {
    clear:both;
}
fieldset.Steam div.create pre:hover {
    background-color:red;
}