Help Trouble shooting a tint overlay appearing only in Chrome web browser

Please could somebody help me find the bit of code that is causing this colour overlay effect issue;
I am working on this test site (BackBone | News) and when viewed in Chrome the key colour (#2ac69c) has what looks like a 5% black overlay - but if you look in the bottom right hand corner of this page it is the correct shade (please see attached image). I just can not find the bit of code that is causing this issue. It looks OK in Firefox and Safari web browsers. Please help. Thank you

Hi @Dawn
Did you manage to resolve this, as I can’t see colour difference in any browser like you have in your screenshot?

Hi Adam
That is very strange, but I am pleased you can not see the same issue. Maybe it is my computer or screen that is playing up! Perhaps it is time for me to go computer shopping.
Thank you so much adam for taking the time to have a look, that is really appreciated.
Best wishes
Dawn