sprInvoice Template is a simple HTML invoice template that is easy to use. Open it up, drop in your text and payment buttons, and it’s good to go. There are demos for new invoices, paid, invoices, and late invoices. Just download and edit them, and there are even 3 main classes that can be applied to #invoice to change the look depending on the invoice’s status.
It’s fully responsive, and easy on the eyes. It uses only two images, those are the payment buttons which you may or may not need – either way they are base64 encoded in the CSS so you don’t have to worry about managing them.
It’s available on Github, under MIT and GPLv2, so take your pick.
To use, simply download and edit. It comes in 3 varieties, LESS, SCSS, and CSS. There are also 3 main classes that can be applied to #invoice to change the look based on whether the invoice is new, paid, or late.
Original Source: https://sprresponsive.com/sprinvoice/