Problem for center text box and botton

-- HikaShop version -- : 2.6.4.
-- Joomla version -- : 2.6.3

Hi.
I would like the text box and button, they were in the middle please.

I tried but I can not. I could say that I put please.

.hikashop_product_quantity_field{
width:25px;
border: 1px solid;

a.hikashop_compare_button, .hikashop_cart_input_button{
text-decoration:none;
color: #3795ff !important;
cursor: pointer;
display: inline-block;
line-height: 18px;
margin: 5px;
padding: 3px 8px;
text-align: center;
box-shadow:none !important;
text-shadow:none !important;
border:1px solid;
border-color: #EEEEEE #DDDDDD #DDDDDD #EEEEEE;
border-radius:3px;
background-color: #eee;
background: -webkit-gradient(linear, left top, left bottom, from(#111111), to(#eee));
background: -webkit-linear-gradient(top, #ffffff, #eee);
background: -moz-linear-gradient(top, #ffffff, #eee);
background: -o-linear-gradient(top, #ffffff, #eee);
background: linear-gradient(top, #ffffff, #eee);