JavaScript Button

Set the width property of the jqxButton.

HTML

<link rel="stylesheet" href="http://jqwidgets.com/public/jqwidgets/styles/jqx.base.css">
<link rel="stylesheet" href="http://jqwidgets.com/public/jqwidgets/styles/jqx.energyblue.css">
<script src="http://jqwidgets.com/public/jqwidgets/jqx-all.js"></script>
<div>
    <input type="button" value="Click me" id='jqxButton'/>
</div>

JavaScript

$('#jqxButton').jqxButton({
    width: '240px',
    theme: 'energyblue'
});

var buttonEnabled=true;

$('#jqxButton').on("click", function(){
    if(buttonEnabled){
        $('#jqxButton').addClass("jqx-fill-state-disabled");
        buttonEnabled = false;
    }else{
        $('#jqxButton').removeClass("jqx-fill-state-disabled");
        buttonEnabled = true;
    }
});