.single-product .detail-block .quantity-container .cart-quantity .btn-primary {
    padding: 5px 10px;
    font-size: 12px;
}

body .btn-primary.disabled,
body .btn-primary[disabled],
body fieldset[disabled] .btn-primary,
body .btn-primary.disabled:hover,
body .btn-primary[disabled]:hover,
body fieldset[disabled] .btn-primary:hover,
body .btn-primary.disabled:focus,
body .btn-primary[disabled]:focus,
body fieldset[disabled] .btn-primary:focus,
body .btn-primary.disabled:active,
body .btn-primary[disabled]:active,
body fieldset[disabled] .btn-primary:active,
body .btn-primary.disabled.active,
body .btn-primary[disabled].active,
body fieldset[disabled] .btn-primary.active {
    background-color: #bebebe;
    border-color: #828282;
}