In the source files of the themes folder on the website, there are sub-folders that contain the information. You must have FTP access via FTP client or web editor such as Dreamweaver to access these source files – this cannot be accessed through the WP admin CMS.
When you access the source files of the site, you can follow the folder navigation path I listed above to find the source file with the code to modify in the page named dynamic-css.php, line 74. There, the code is located to change the property from fixed to scroll.
I would recommend running a full site backup first before modifying the source code, or find someone with html skills that can navigate to the source code before changing. Also, if this change is made in the parent theme (if you have not created a child theme), any future automatic updates will erase any code modifications you have made, and will need to be added back.
Here is modified code to place in the dynamic-css.php file:
$custom_css .= ”
.inner-main-title {
background-image:url(‘{$bg_image_url}’);
background-repeat:no-repeat;
background-size:cover;
background-attachment:scroll;
background-position: center;
height: {$education_base_header_height}px;
}”;
I hope this helps!
Gabe