I am trying to use 960 grid css .
How do I do away with the space between two divs one above the other ? [ the space between the blue lines as shown in the picture ] 
I generated my CSS using the CSS generator at http://grids.heroku.com/ .
I generated the CSS for a grid with 12 columns and width of 720 [ as below ]
http://grids.heroku.com/grid?column_width=59&column_amount=12&gutter_width=1
My html code is as below
<div class="container container_12">
<div class="grid_12">
<p>
12
</p>
</div>
<div class="clear"></div>
<div class="grid_5">
<p>
5
</p>
</div>
<div class="grid_7">
<p>
7
</p>
</div>
<div class="clear"></div>
<div class="grid_3">
<p>
3
</p>
</div>
<div class="grid_9">
<p>
9
</p>
</div>
</div>
it’s the margin on the P tags inside those divs which is creating the vertical space. set
container div p {margin:0}and it all goes away.