Separator line colour will not change

I’ve searched the forum and found a few different version of custom css that should change the colour of a standard default separator on a page, I tried adding each of them one at a time to my custom css and could not get the separator line to show up.
Here is our website: http://bondcreate.com/
The separator line should be after the bigger text and before the line of counters, you can see the Go To Top text where the separator should be.
Please let me know what the proper custom css should be to make this line show up on the page, the colour we’re aiming for is #0057a6
Thanks!