Open the Web page in Dreamweaver and select the "Code view" to switch to it. Scroll down the HTML to the portion of the page that you'd like to contain with a horizontal scrolling area.

How to Center a Website Without a Scroll. Website designs for businesses and other organizations often incorporate well-defined branding and marketing elements. If your website has a Web page you ...

As a result, you cannot use this trick when you are writing a long blog post in a web page editor or using a desktop text editor to modify a long document.