main-site/components/styles/generic.tsx

import styled from 'styled-components'

export const StyledBody = styled.body`
  padding: 0;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, Segoe UI, Roboto, Oxygen,
    Ubuntu, Cantarell, Fira Sans, Droid Sans, Helvetica Neue, sans-serif;
`

interface MobilePropType {
  mobile?: number;
}

export const Page = styled.div<MobilePropType>`
  width: 100%;
  background-color: ${({ theme }) => theme.colors.background};
  background-image: ${({ theme }) => theme.backgroundImage ? "url(" + theme.backgroundImage + ")" : ""};
  background-repeat: no-repeat;
  background-attachment: fixed;
  background-size: cover;
  background-position: ${ props => props.mobile ? ({ theme }) => theme.backgroundOffset ? theme.backgroundOffset :  "60%" : ""};
`

export const Main = styled.main`
  color: ${({ theme }) => theme.colors.primary };
  min-height: 100vh;
  padding: 1rem 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
`

export const Footer = styled.footer`
  color: ${({ theme }) => theme.colors.primary };
  display: flex;
  flex: 1;
  padding: 2rem 0;
  border-top: 1px solid ${({ theme }) => theme.colors.primary };
  justify-content: center;
  align-items: center;

  a {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-grow: 1;
  }
`

export const MobileFooter = styled(Footer)`
  white-space: nowrap;
  flex: 0.5;
  width: 100%;
`