Different behavior between chrome and firefox for a form

[Kcchouette]

Hello

for this HTML code (a simple search form):

		<section class="navbar-section">
			<form name="searchform">
				<fieldset class="input-group input-inline">
					<input type="text" name="search" class="form-input"  placeholder="Search on"   required/>
					<select name="bot" class="form-select">
						<option value="">ALL BOTS</option>
						<option value="option1" selected>option1</option><option value="option2">option2</option>				</select>
					<input type="submit" class="btn btn-primary input-group-btn" value="Search"/>
				</fieldset>
			</form>
		</section>

here how it displays on firefox:

and here how it displays on chrome:

Can you fix the chrome displays, please?

Thanks!