AlishaK

Try this
.image-button * { font-family: 'MDNichrome0.7'; font-weight: 400; }  

This one is working on my page, you can try. ( For background color)
/* Shopping cart background */
body#cart {
    background-color: #ffffff;
}
 
Here for the text color:
 
/* Variant */
.variant-info * {
    color: black;
}
/* price */
.item-price {
    color: black;
}
/* subtotal price */
._2nJjmtuOe * {
    color: black;
}
/* cart page product title color */
.item-desc a {
    color: black;
}
 

Add to Design > Custom CSS
/* Cart page */ body#cart #page { background: #F7EFE7; } body#cart div#sqs-cart-root * { color: black !important; }