Demo Code:

<link rel="stylesheet" href="/richtexteditor/rte_theme_default.css" />
<script type="text/javascript" src="/richtexteditor/rte.js"></script>
<script type="text/javascript" src='/richtexteditor/plugins/all_plugins.js'></script>

<div id="div_editor1">
	<p>​​​​​​​Rounded Corner Theme</p>
</div>

<script>
	var editor1 = new RichTextEditor("#div_editor1", { skin: "rounded-corner", toolbar: "basic" });
</script>
<br />
<br />

<div id="div_editor2">
	<p>​​​​​​​Gray Theme</p>
</div>

<script>
	var editor2 = new RichTextEditor("#div_editor2", { skin: "gray", toolbar: "basic" });
</script>
<br />
<br />

<div id="div_editor3">
	<p>​​​​​​​Blue Theme</p>
</div>

<script>
	var editor3 = new RichTextEditor(document.getElementById("div_editor3"), { skin: "blue", toolbar: "basic" });
</script>
<br />
<br />

<style>
	.purple_editor {
		background-color: #b19cd9 !important;
		border-color: #8470a8 !important;
	}

		.purple_editor rte-toolbar {
			background-color: #b19cd9 !important;
		}

		.purple_editor rte-bottom {
			background-color: #b19cd9 !important;
		}

		.purple_editor rte-dialog-inner {
			background-color: #b19cd9 !important;
		}

		.purple_editor rte-line-spliter {
			background-color: #b19cd9 !important;
		}

		.purple_editor rte-dialog-header {
		}
</style>
<div id="div_editor4" class="richtexteditor purple_editor">
	<p>Create a purple theme using css</p>
</div>
<script>
	var editor4 = new RichTextEditor(document.getElementById("div_editor4"), { toolbar: "basic" });
</script>