Under your DROPBOX folder named “Public”, create another folder called “site” to host your website. Place all your static HTML+CSS+javascript pages inside this new folder.
The “site” folder will act as the root folder for your static website. You can right click on the homepage to obtain the public URL link for it under Dropbox menu (index.html). The link can be shared with other people. The person who has the link will be able to open the webpage.
Alternatively, you can use TinyURL or bit.ly or Google URL Shortner to create a shorter, custom link to your page or setup a CNAME redirect entry in you DNS management of the domain name you already own.