Execute JavaScript in Primary Header

I would like to change the background colour of the default header that shows when I preview the full project. How do I do that? I can see where I can create one, but I just want to change the colour.  

Hi everyone In a Flow project, I am currently using two different headers for two different types of pages. What we've recently noticed is that when we switch from a page with a header to a page with no headers, there is a delay between when the header disappears. The header from the previous page remains for a few seconds. If there a location within DK where a setting has to be disabled or is this meant to happen? The header is a simple image Thanks  

Is there any way to lock the header section in a vertical scrolling project so that it stays fixed in place at the top of the screen whilst the rest of the screen is scrolled?  

I currently have a project that was developed in Claro that includes quite a few target pages to incorporate branching. The customer wants to eliminate any type of branching or extraneous clicking and has asked that I make the project linear. Is there a way for me to convert the target pages to main pages? Or do I need to redo every page from scratch? When I click on new page from existing project the only options I get are "Structure" and "Master".   

In reading the article Rounding Rollercoaster, please confirm if this javascript update can be made in Flow. In a course being developed, quiz scores show as decimals when less than 100%.  Some questions have more than 1 correct answer.  

I'm trying to create an interaction where pressing the Close button on a pop-up triggers the previous element on the page to hide and a new element to show. Is it possible to achieve that (perhaps by leveraging JavaScript in the conditions)?    Thanks! 

I want to change the style and add some interactivity to flip cards and tab table elements. Can I add html, css, javascript to flip cards or other elements and if so, what is the workflow?  

Is there a way to add a trigger to every page in a project at once? I'm attempting to add javascript that is triggered on page load for every page in a course (after the course was already completed - this is for a migration effort). The only way I can find to do this is adding them one at a time to each page, which is painfully time-consuming.   

Before showing a pop-up, I would like to check if a user input (string) save within a variable contains a particular word/words. I have tried using the JavaScript includes() method within the conditions field but this doesn’t seem to work. Is there another way I can achieve this?