Parallex effect ia not working

My parallax effect is not working with this code. what can be the reason for it?

.ss{ background: linear-gradient(335deg, rgba(255,140,107,1) 0%, rgba(255,228,168,1) 100%); background-repeat: no-repeat; background-image: url('//'); height: 700px; background-attachment: fixed !important; background-position: center; background-size: cover; position: relative; clear: both; }

What exactly is not working? What do you want to achieve? Where did you add the code? Make sure to select the Additional CSS field in the code Editor. If you put it in the header, don’t forget to wrap it in a style tag.

I just tested your code in a new project. Works for me. The image shows as a fixed background.