How can i make some blurring layer. It looks like when appears registration window (or anything) and background becomes blurry. I try to remember sites with this effect but i can't. May be you know. I want to link buttons with appearing this layer for site presentation.
Thank you so much)
You're talking about Lightbox effect where the primary dialog window is active and the background goes blurred. This feature is not present in InDesign. You might try Adobe Muse for such effect in your website. Adobe Muse has predefined and customizable LightBox effects which makes your job easier.