Its odd that you went the php route as html and css is about the easiest thing to learn.
All you have to do is set class='name' within the html tag of a part of the page and then in css do this:
.name {
parameter:settings;
}
an example is this:
<table class='tb1'>
on the html side, then in the css file all you put is
table.tb1 {
border-top:1px solid black;
}
and it will add a solid black border to the table you specified.
the kicker is you have to add <link rel="stylesheet" href="style.css" type="text/css" />
to the header in the html file you are including the style on
This is just an idea of css on html
