how to Fix My Signup Form Width??? I'm using mailchimp

hey
I need to Configure this Form. I need to increase the Width of the form.
here is the code:

<!-- Begin MailChimp Signup Form -->
<!--[if IE]>
<style type="text/css" media="screen">
	#mc_embed_signup fieldset {position: relative;}
	#mc_embed_signup legend {position: absolute; top: -1em; left: .2em;}
</style>
<![endif]--> 
<!--[if IE 7]>
<style type="text/css" media="screen">
	.mc-field-group {overflow:visible;}
</style>
<![endif]-->

<div id="mc_embed_signup">
<form action="http://alirkhan.us1.list-manage.com/subscribe/post?u=84538d4628470956cd7e596a1&id=75fdd0504b" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" style="font: normal 100% Arial, sans-serif;font-size: 18px;background:#ccc;">
	<fieldset style="-moz-border-radius: 4px;border-radius: 4px;-webkit-border-radius: 4px;border: 1px solid #ccc;padding-top: 1.5em;margin: .5em 0;background-color: #000;color: #fff;">
	<legend style="text-transform: capitalize;font-weight: bold;color: #000;background: #ccc;padding: .5em 1em;border: 60px solid #ccc;-moz-border-radius: 4px;border-radius: 4px;-webkit-border-radius: 4px;font-size: 1.2em;">join our mailing list</legend>
<div class="indicate-required" style="text-align: left;font-style: italic;overflow: hidden;color: #fff;margin: 0 9% 0 0;">* indicates required</div>
<div class="mc-field-group" style="margin: 1.3em 5%;clear: both;overflow: hidden;">
<label for="mce-EMAIL" style="display: block;margin: .3em 0;line-height: 1.5em;font-weight: bold;float:left;">Email Address <strong class="note-required">*</strong>
</label>
<input type="text" value="" name="EMAIL" class="required email" id="mce-EMAIL" style="margin-right: 1.5em;padding: .2em .3em;width: 95%;float: left;z-index: 999;">
</div>
<div class="mc-field-group" style="margin: 1.3em 5%;clear: both;overflow: hidden;">
<label for="mce-FNAME" style="display: block;margin: .3em 0;line-height: 1em;font-weight: bold;float:left;">Name </label>
<input type="text" value="" name="FNAME" class="" id="mce-FNAME" style="margin-right: 1.5em;padding: .2em .3em;width: 95%;float: left;z-index: 999;">
</div>
		<div id="mce-responses" style="float: left;top: -1.4em;padding: 0em .5em 0em .5em;overflow: hidden;width: 90%;margin: 0 5%;clear: both;">
			<div class="response" id="mce-error-response" style="display: none;margin: 1em 0;padding: 1em .5em .5em 0;font-weight: bold;float: left;top: -1.5em;z-index: 1;width: 80%;background: #FBE3E4;color: #D12F19;"></div>
			<div class="response" id="mce-success-response" style="display: none;margin: 1em 0;padding: 1em .5em .5em 0;font-weight: bold;float: left;top: -1.5em;z-index: 1;width: 80%;background: #E3FBE4;color: #529214;"></div>
		</div>
		<div><input type="submit" value="Subscribe" name="subscribe" id="mc-embedded-subscribe" class="btn" style="clear: both;width: auto;display: block;margin: 1em 0 1em 5%;"></div>
	</fieldset>	
	<a href="#" id="mc_embed_close" class="mc_embed_close" style="display: none;">Close</a>
</form>
</div>

<!--End mc_embed_signup-->

Code (markup):

Thanks in advance.