Hello, Marcos!
Try to use the following codes, please let me know if I something missed:
/*Cart total white bars*/
.woocommerce-cart .cart_totals th{
background-color: #964626;
color:white;
}
/*Cart total title*/
.woocommerce-cart .cart_totals h2{
color:white;
}
/*Cart total font color*/
.woocommerce-cart .cart_totals td{
color:white;
}
/*Button*/
.wc-proceed-to-checkout .checkout-button{
background:#964626;
}
.wc-proceed-to-checkout .checkout-button:hover{
opacity: .9;
}
.woocommerce-checkout .form-row label{
color:white!important;
}
Regards