strapi/packages/strapi-admin/admin/src/themes/sizes.js

const sizes = {
  header: {
    height: '6rem',
  },
  leftMenu: {
    height: '6rem',
    width: '24rem',
  },
  margins: {
    // TODO:
    sm: '10px',
  },
  padding: {
    // TODO
    md: '30px',
  },
};

export default sizes;