Make "Checkout" font bigger on Debutify theme

[checkoutfirst]

Hello, can someone please supply the simple code where I can adjust the font size for the "checkout" button on my cart page. This is for Debutify theme.

My website is at www.checkoutfirst.com
Please see sample of what I'd like done. The text should be the same size as the red box in image.

[KetanKumar · Accepted solution]

@checkoutfirst 

oh sorry for that issue can you try this code

1. Go to Online Store->Theme->Edit code
2. Asset->/theme.scss.liquid->paste below code at the bottom of the file.

.btn--checkout {font-size: 20px;font-weight: 600;letter-spacing: 1px;}