I am in the process of developing a login/register page and I would like to implement a feature where, upon clicking the 'register now' button on the home page, a popup appears within the same website with a transparent and dull background. An example of what I have in mind can be seen here:
I also came across this reference that demonstrates a similar concept:
Essentially, I am seeking guidance on how to achieve this effect without relying too heavily on JavaScript or jQuery. Your assistance is greatly appreciated. Thank you.