FontSize component for setting the size. Valid sizes range from 0 to 7, and default is 3 (16px).

    <div>
      <FontSize size="0">This is size 0.</FontSize>
      <FontSize size="1">This is size 1.</FontSize>
      <FontSize size="2">This is size 2.</FontSize>
      <FontSize size="3">This is size 3.</FontSize>
      <FontSize size="4">This is size 4.</FontSize>
      <FontSize size="5">This is size 5.</FontSize>
      <FontSize size="6">This is size 6.</FontSize>
      <FontSize size="7">This is size 7.</FontSize>
    </div>

Can be rendered with something else than div

    <FontSize size="1" tag="h1">This is a small text rendered as h1</FontSize>

We're using [styled-components-breakpoint](https://github.com/jameslnewell/styled-components-breakpoint) for handling responsive font sizes. Just provide a map of breakpoints to set different font sizes based on breakpoints, like `{ mobile: 2, tablet: 4, desktop: 6 }`.

    <FontSize size={{ mobile: 2, tablet: 4, desktop: 6 }}>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</FontSize>