Thanks! 
Yes. To change the colors you need to fork the theme and update the color code as per your requirement. Here’s how you can do it:
In variables.scss change the color code as per your liking:
$color-blue: #e5f8ff;
$color-square-gradient: linear-gradient(4deg, rgba(143,236,202,.29) 55%, rgba(74, 247, 255, 0.08) 100%);
$color-square-webkit-gradient: -webkit-linear-gradient(4deg, rgba(143,236,202,.29) 55%, rgba(74, 247, 255, 0.08) 100%);
To change the background color update the secondary color in about.json (note that this will also change text color of some buttons):
"secondary": "F6FBFC"