After theme update my hovor colour changed

Hello,

my site is not live yet, but i updated the theme and my hovor colours all changed, from yellow button would fade to a slightly darker yellow, now i have one grey and one blue, with a yellow button

i found using google developer console that i could change the hovor with

  --mfn-button-theme-bg-hover: #ffffff;

  --mfn-button-bg-hover: #ffffff;

where in the theme do i change these colours,

I am using a standard button box.

Orginal colour thats how i want it

When you hovor over the button it goes to grey or blue, it use to be a slightly darker shade of yellow

thank you

:)