larry888, here is the code for my Menu. Feel free to copy and modify all you want.

#access {
background:#e89187;
border:1px solid #000000;
border-width:1px 0;
margin:0 auto 1.8em;
padding-left:.9em;
position:relative;
z-index:99;
}

#access ul {
list-style:none;
margin:0;
padding-left:0;
}

#access li {
float:left;
position:relative;
}

#access li li {
min-width:9em;
width:100%;
}

#access a {
color:#000000;
display:block;
font-size:.813em;
line-height:1.75em;
padding:.6em 1em;
text-decoration:none;
text-transform:uppercase;
}

#access a:hover {
background:#e6e6e6;
color:#0099ff;
-webkit-transition:background .2s linear;
-moz-transition:background .2s linear;
-o-transition:background .2s linear;
}

#access ul ul {
box-shadow:0 3px 3px rgba(0,0,0,0.2);
-moz-box-shadow:0 3px 3px rgba(0,0,0,0.2);
-webkit-box-shadow:0 3px 3px rgba(0,0,0,0.2);
display:none;
float:left;
position:absolute;
top:2.3em;
left:0;
z-index:99999;
}

#access ul ul ul {
left:100%;
top:0;
}

#access ul ul a {
background:#000000;
color:#ffffff;
line-height:2.1em;
padding:.5em .5em .5em 1em;
height:auto;
}

#access li:hover > a,#access ul ul :hover > a {
background:#000000;
color:#ffffff;
}

#access ul ul a:hover {
background:#e89187;
color:#000000;
}

#access ul li:hover > ul {
display:block;
}

#access .current_page_ancestor > a,#access .current_page_item > a,#access .current_page_parent > a,#access .current-menu-ancestor > a,#access .current-menu-item > a,#access .current-menu-parent > a {
background:#000000;
color:#ffffff;
}

#access .current_page_ancestor > a:hover,#access .current_page_item > a:hover,#access .current_page_parent > a:hover,#access .current-menu-ancestor > a:hover,#access .current-menu-item > a:hover,#access .current-menu-parent > a:hover {
background:#ffffff;
color:#000000;
}

Is this possible with CSS?

No. CSS editing cannot be used to change the way any theme functions. We cannot edit templates or themes. http://en.support.wordpress.com/themes/editing-themes/

Does the Custom Design upgrade let me edit HTML?
No. The Custom Design upgrade allows you to edit fonts and CSS only. You can change the appearance of a theme, but not its HTML markup, PHP code, or content. http://en.support.wordpress.com/custom-design/#frequently-asked-questions

In the majority of themes, posts on category or other archive pages show up just as they do on the main posts page in the blog. See this page > Settings > Reading and note how many posts you choose there sets it for all pages.

My website is :thetwschool.com.

Larry