Custom Input Dropdown Array


i have a input dialog mit a Array in the Options “UniqueItems.ToArray”. This input dialog is too small for my output. I would like realise a custom input activity with HTML. What is the right way to output my array in a dropdown menu?:

<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<select name="select" id="UniqueItems.ToArray">

  <script type="text/javascript">
	function SubmitValues(){
		var UniqueItems.ToArray = document.getElementById("UniqueItems.ToArray").value;
		return true;


Nobody a idea for a solution?