form element mobile

<form name="product_adding" method="post" action="">
<input type="hidden" name="artid" value="12462">
<div class="orderandquantity">
<div class="order_container">
<div class="quantity">
<input type="text" name="quantity" class="quantity_artpage" value="1">
</div>
<span class="quantity_cross">X</span>
 <input name="orderbutton" type="submit" class="orderbut" style="float:none;" value="In winkelwagen" onclick="$.add2cart( 'product_12462', 'cart')"> 
 </div>
</div>
 </form>

.orderandquantity{
	background-color: #e4e6e6;
	height: 50px;
	box-sizing: border-box;
	padding: 8px 10px
}

.order_container{
	float:right;
}
.quantity{
	float:left;
}

.quantity_artpage{
	height: 35px;
	width: 37px;
	border: 1px solid #C9C9C9;
	border-radius: 3px;
	text-align: center;
	padding-top: 2px;
	display: inline-block;
	vertical-align: middle;
	box-shadow: inset 0 0 5px 0px #CDCDCD;
	box-sizing: border-box;
}

.quantity_cross{
	display: inline-block;
	margin-left: 10px;
	margin-right: 10px;
	margin-top:10px;
}




.orderbut,.orderbut:visited{
	background: -webkit-linear-gradient(#ffc000, #ffa700);
	background: -o-linear-gradient(#ffc000, #ffa700);
	background: -moz-linear-gradient(#ffc000, #ffa700);
	background: linear-gradient(#ffc000, #ffa700);
	background: -webkit-linear-gradient(#ffc000, #ffa700);
	background: -o-linear-gradient(#ffc000, #ffa700);
	background: -moz-linear-gradient(#ffc000, #ffa700);
	background: linear-gradient(#ffc000, #ffa700);
	color: #fff;
	text-decoration: none;
	text-align: center;
	cursor: pointer;
	border: 0;
	display: inline-block;
	padding-top: 8px;
	padding-bottom: 8px;
	padding-left: 12px;
	padding-right: 12px;
	font-size: 14px;
	border-radius: 3px;
	margin-top: -4px;
	vertical-align: middle;
	padding: 10px 20px 10px 20px;
	box-sizing: border-box;
	height: 35px;
}