You can change the color of all “Cart Custom Info” text by pasting this:

div.cart_totals
{
color: green;
}

table.shop_table.shop_table_responsive
{
color: black;
}

into “Custom CSS” module under “Custom CSS – Front end (Customers)”. You can find that module in “Emails & Mics.” section. To customize the color, change the word green to any other color, or use color codes such as #FF0000 (this means red).

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