Step 1:
Navigate to WordPress Admin Dashboard > Appearance > Customizer > Hostiko Customizer > Cart Icon > Background Color.

Step 2:
To change the color search for Color.

Step 3:
To change the Border color search for Border Color.

Step 4:
To change the Border Radius search for Border Radius.

Step 5:
To change the Cart Hover background search for Background Hover Color.

Step 6:
To change the Cart Hover Color search for Hover Color.

Step 7:
Click on Publish once you are done with all of changes.