Change CSS font of the Google Search Form?

I have this css search form on the left top, above the flags. Please see this LINK

<form action="https://neculaifantanaru.com/search.html" method="get" id="site-search">
    <fieldset>
        <!-- <label for="search">Cauta in site</label> -->
        <input type="text" name="q" id="q" value="" />&nbsp;&nbsp;
        <button type="submit" class="btn btn-inverse">cauta</button>
    </fieldset>
</form>

I made this css:

#site-search {float:right;width:240px;margin:0;padding:0px 0px 0px 0px;font-size:11px;background:#white;}
#site-search LABEL {display:inline-block;font-size:11px;color:#red;}
#site-search INPUT {width:140px;height:22px;margin:90;padding:0px 9px 0px;border-color:#yellow;background:#blueviolet;font-size:11px;}
#site-search BUTTON {width:45px;height:22px;padding:0;margin:90;font-size:11px;line-height:13px;}

I want to change the css above, in order to look like this. LINK 2 So, what should I change on my css for this?