jQWidgets uses a pair of css files - jqx.base.css and jqx.[theme name].css. The base stylesheet creates the styles related to the widget's layout like margin, padding, border-width, position. The second css file applies the widget's colors and backgrounds. The jqx.base.css should be included before the second CSS file.
Below is the list of CSS classes used by jqxTextArea.<script type="text/javascript"> $(document).ready(function () { $('#jqxTextArea').jqxTextArea({ theme: 'summer', width: 250, height: 100, placeHolder: 'Enter a sentence...' }); });</script>
<!DOCTYPE html><html lang="en"><head> <title>jQuery TextArea Styling Sample</title> <link rel="stylesheet" href="../../jqwidgets/styles/jqx.base.css" type="text/css" /> <link rel="stylesheet" href="../../jqwidgets/styles/jqx.summer.css" type="text/css" /> <script type="text/javascript" src="../../scripts/jquery-1.11.1.min.js"></script> <script type="text/javascript" src="../../jqwidgets/jqxcore.js"></script> <script type="text/javascript" src="../../jqwidgets/jqxbuttons.js"></script> <script type="text/javascript" src="../../jqwidgets/jqxscrollbar.js"></script> <script type="text/javascript" src="../../jqwidgets/jqxtextarea.js"></script> <script type="text/javascript"> $(document).ready(function () { $('#jqxTextArea').jqxTextArea({ theme: 'summer', width: 250, height: 100, placeHolder: 'Enter a sentence...' }); $('#jqxTextArea').jqxTextArea('val', 'jQWidgets is a comprehensive and innovative widget library built on top of the jQuery JavaScript Library. It empowers developers to deliver professional, cross-browser compatible web applications, while significantly minimizing their development time. jQWidgets contains more than 60 UI widgets and is one of the fastest growing JavaScript UI frameworks on the Web.'); }); </script><script async src="https://www.googletagmanager.com/gtag/js?id=G-2FX5PV9DNT"></script><script>window.dataLayer = window.dataLayer || [];function gtag(){dataLayer.push(arguments);}gtag('js', new Date());gtag('config', 'G-2FX5PV9DNT');</script></head><body> <textarea id="jqxTextArea"></textarea></body></html>