Why wont Wordpress add a new line?

I am making a wedding website and struggling a bit with a page I am trying to hack about with.

For some reason when I ad <br> anywhere it seems to ignore it. I need to put a line between the H3 heading and the left justified form area.

Help?

Hannah & Oliver

<h3 style="text-align: center;">If you are able to attend, please select your menu options below</h3>

<div style="width: 40%; padding: 0 10pt 0 0; float: left;">
<h2 style="text-align: center;">Select Menu Options</h2>
&nbsp;

[form 10012]

</div>
<div style="width: 40%; padding: 0 10pt 0 0; float: right;">
<h2 style="text-align: center;">Wedding Menu</h2>
<p style="text-align: center;"><strong>STARTERS</strong></p>
<p style="text-align: center;">HAM HOCK AND PARSLEY TERRINE, PEASE PUDDING, PICKLED SHALLOT</p>
<p style="text-align: center;">GOAT'S CHEESE, PLUM TOMATO AND BASIL TART, ROCKET AND BALSAMIC SALAD</p>
<p style="text-align: center;">TOMATO AND BASIL SOUP WITH PESTO CROUTE</p>
<p style="text-align: center;"><strong>MAIN COURSES</strong></p>
<p style="text-align: center;">ROAST BREAST OF CORN FED FREE RANGE CHICKEN, FONDANT POTATO,</p>
<p style="text-align: center;">SAVOY CABBAGE WITH PANCETTA, CARROT PUREE, HERB JUS</p>
<p style="text-align: center;">ULTIMATE STEAK BURGER ULTIMATE STEAK BURGER WITH SMOKED BACON, CHEDDAR</p>
<p style="text-align: center;">CHEESE TOMATO CHUTNEY AND SKINNY CHIPS</p>
<p style="text-align: center;">ROASTED SWEET PEPPERS FILLED WITH BASIL AND SUN BLUSHED TOMATO COUS COUS,</p>
<p style="text-align: center;">SWEETCORN AND MUSHROOM FRITTER BASIL AND ROCKET SALAD</p>
<p style="text-align: center;"><strong>DESSERTS</strong></p>
<p style="text-align: center;">STICKY TOFFEE PUDDING, BUTTERSCOTCH SAUCE, VANILLA ICE CREAM</p>
<p style="text-align: center;">RICH CHOCOLATE TORTE RICH CHOCOLATE TORTE WITH CHERRY COMPOTE AND</p>
<p style="text-align: center;">CHOCOLATE ICE CREAM</p>
<p style="text-align: center;">TRADITIONAL ETON MESS ETON MESS WITH ENGLISH STRAWBERRIES</p>

<h2 style="text-align: center;">Children's Menu</h2>
<p style="text-align: center;">STARTERS</p>
<p style="text-align: center;">VEGETABLE FINGERS WITH SOUR CREAM AND SALSA</p>
<p style="text-align: center;">TOMATO SOUP WITH HERBY CROUTONS</p>
<p style="text-align: center;">SLICED MELON AND SEASONAL FRUIT</p>
<p style="text-align: center;">MAIN COURSES</p>
<p style="text-align: center;">HOMEMADE CHICKEN STRIPS, MINI JACKET POTATO, BUTTERED PEAS</p>
<p style="text-align: center;">SPAGHETTI WITH TOMATO SAUCE AND GARLIC BREAD</p>
<p style="text-align: center;">BEANS ON TOAST WITH CHEDDAR CHEESE</p>
<p style="text-align: center;">DESSERTS</p>
<p style="text-align: center;">FRESH FRUITS</p>
<p style="text-align: center;">ICE CREAM</p>
<p style="text-align: center;">STICKY TOFFEE PUDDING, BUTTERSCOTCH SAUCE</p>

</div>