Change button color and font color - Description/Related Products

I'm trying to change button background and font colors.

I have changed the following below. You can see where I did figure out the background of the button color, but can't figure out how to change the font color... it appears it is a setting that changes link colors etc.
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a.mp_button-checkout {
background-color:#547575;
border-color:#a89084;
border-bottom:2px solid #a89084;
}
a.mp_button-checkout {
font-weight: bold;
color: white;
}
a.mp_button mp_button-continue-shopping mp_button-large {
background-color:#ffffff;
}
a.mp_button mp_button-continue-shopping mp_button-large {
font-weight: bold;
color:#547575;
}
a.mp_product_tab_label_link.mp-product-overview {
background-color:#dccc65;
border: 1px solid#a89084;
}
a.mp_product_tab_label_link.mp-related-products {
background-color: #dccc65;
border: 1px solid#a89084;
}