How can I add some style to the following search box code

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CSS

Hello just took and was wondering if anyone knew or if there is a way to add some styling to the following search box code foe Ex: button color here is the code for my current search box . Any help and or instructions where to place css code etc if you can let me know thanks in advance .

Here is the code snippet

<form id="frmSearch" class="search2" method="get" action="default.html" />
   <input class="search2" id="txtSearch" type="text" name="serach_bar" size="31" maxlength="255" value="" placeholder="Enter Keyword Search For Here:" style="left: 396px; top: 153px; width: 293px; height: 26px;" />
   <input class="search1" type="submit" name="submition" value="Search Site" />



   <script type=" text/javascript">
       document.getElementById('frmSearch').onsubmit = function() {
           window.location = 'http://www.google.com/search?q=site:yoursitename.com ' + document.getElementById('txtSearch').value;
           return false;
       }

   </script>

What I have tried:

Not sure how to style the button and looked on goof\gle but did not find what i was looking for.