Lock background image so it won't moving upon scrolling

Hi. I'm looking to find a way to keep my background image stable when user is scrolling.

How can i lock the background image in place?

What template are you using? if it is in the brine family do this:

1. In the Home Menu, click Design, then Site Styles.
2. Scroll down to the Main: Overlay section.
3. Check DIsable Parallax.
4. You may also want to check Parallax Smart Crop to minimize cropping.
5. Click Save. 

1 minute ago, derricksrandomviews said:

What template are you using? 

I figured, so you can change that as I posted. Don't change the parallax smart crop however, unless you just want to see what it does. 

7 minutes ago, derricksrandomviews said:

What template are you using? if it is in the brine family do this:

1. In the Home Menu, click Design, then Site Styles.
2. Scroll down to the Main: Overlay section.
3. Check DIsable Parallax.
4. You may also want to check Parallax Smart Crop to minimize cropping.
5. Click Save. 

Thanks for your suggestion. Disabling the parallax in site styles it also locks the image in front of background image. I want to keep the parallax effect with the image but background image has to be stable to look nice. Now when scrolling both background image and image in front are moving upon scrolling.

Just made it with custom CSS. Thank you for your answers!

Could you post the code? Other folks might need to do the same thing. 

2 hours ago, derricksrandomviews said:

Could you post the code? Other folks might need to do the same thing. 

Yes of course!

.collection-type-index #HERE_GOES_THE_URL_SLAG_NAME_OF_THE_PAGE_WE_NEED_TO_APPLY_THE_BACKGROUND_IMAGE {
  background-image: url("HERE GOES THE URL OF OUR BACKGROUND IMAGE WE UPLOADED THROUGH MANAGE_CUSTOM_FILES BUTTON INSIDE CUSTOM CSS SECTION");
  background-size: cover;
  background-attachment: fixed;
  background-repeat: no-repeat;
}

The perfect background image size to fit exactly is 1500 pixels x 2500 pixels.

Can you provide a link to the page so I can see your solution in action?