Color – Banners & text boxes / social buttons

Hi,

Wondering if it is possible to change the banner colours on pages from pinkish hue to another colour?

Also, i want to change the background and ‘warm up’ the white background but when i try the area where text appears stays the same. I’m not such a whizz – but is there code i could use and if so where would I put it so changes affect whole site?

Also when adding social button the social button logo does not appear the circle and the button is quite translucent. How do i fix this issue?

Any help would be fantastic.