Every published page has jQuery included
Note: We are using jQuery.noConflict() on published pages, so if you are writing custom jQuery code, be sure to use the jQuery keyword and not the $ dollar sign function.
How to insert custom scripts into your page
You'll notice you can choose where the script should be placed in the document - it defaults to "Before Body End Tag" (before </body>) but you can change that to "After Body Tag" (after <body>), or "Head" (<head>), depending on what your script is trying to accomplish.
Note: Whatever script you are including, make sure you wrap it in <script> tags as the dialogue mentions. Also, it's important to note that this script will only execute in preview mode, or on a published page (and not in the editor).
How to include custom CSS
Any CSS that you can do on a normal webpage is possible in an Unbounce page. The class/ID for each object on your page can be found by first selecting that object in the Unbounce editor, then looking over in the properties pane under the section Advanced . This will let you write CSS rules for specific elements (each element is assigned a unique ID).
Some examples of pre-written custom Script and CSS