Ответ 1
вы можете поместить этот тип элементов
HTML
<div class="container">
<div class="col-lg-6">
<div class="input-group my-group">
<input type="text" class="form-control" name="snpid" placeholder="Test"/>
<select id="lunch" class="selectpicker form-control" data-live-search="true" title="Please select a lunch ...">
<option>Hot Dog, Fries and a Soda</option>
<option>Burger, Shake and a Smile</option>
<option>Sugar, Spice and all things nice</option>
<option>Baby Back Ribs</option>
<option>A really really long option made to illustrate an issue with the live search in an inline form</option>
</select>
<span class="input-group-btn">
<button class="btn btn-default my-group-button" type="submit">GO!</button>
</span>
</div>
</div>
<div>
CSS
.my-group .form-control{
width:50%;
}
JQuery
if ( $.browser.webkit ) {
$(".my-group-button").css("height","+=1px");
}