namae/src/theme/index.tsx

import styled, { createGlobalStyle } from '@emotion/styled';
import { mobile } from '../util/css';
import { css } from '@emotion/react';

export const globalStyle = css`
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  html {
    font-size: 100%;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto',
      'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans',
      'Helvetica Neue', sans-serif;
    line-height: 1.625em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: #ffffff;

    ${mobile} {
      background: #f5f5f5;
    }
  }
`;

export const Content = styled.div`
  padding-top: 100px;

  ${mobile} {
    padding-top: 60px;
  }
`;

export const Header = styled.header`
  padding: 0 40px;
  background-image: linear-gradient(#9f78ff, #1b24cc 99%);

  ${mobile} {
    padding: 0 20px;
  }
`;

export const Section = styled.div`
  padding: 100px 20vw;

  ${mobile} {
    padding: 60px 40px;
  }
`;