Join bootstrap search box and Search button and curve the right side of Search button

[saitl]

Here is my bootstrap code\[code\] <div class="input-append" align="center" > <input type="text" name="q" class="span2 search-query" placeholder="Snipp or Tag"/> <button type="submit" class="btn">Search</button> </div>\[/code\]Here is a jsfiddleIs there a way to join the Search box and Search button and also curve the right hand side of \[code\]Search\[/code\] button