old_contents: import React, { PureComponent } from 'react';
  import glamorous, { Div } from 'glamorous';
  import StatCalculator from 'components/StatCalculator';
  import Equipment from 'components/Equipment';
  
  const appStyle = {
    display: 'flex',
    flexDirection: 'column',
    justifyContent: 'center',
    alignItems: 'center',
    height: '100vh',
    ':after': {
      content: `''`,
      display: 'block',
      position: 'absolute',
      top: '0',
      left: '0',
      width: '100%',
      height: '100%',
      backgroundImage: `url('images/background.jpg')`,
      opacity: '0.35'
    }
  }
  
  export default class App extends PureComponent {
    render() {
      return (
        <Div css={appStyle}>
          <StatCalculator />
        </Div>
      );
    }
  }
  
new_contents: import React, { PureComponent } from 'react';
  import glamorous, { Div } from 'glamorous';
  import StatCalculator from 'components/StatCalculator';
  import Equipment from 'components/Equipment';
  
  const appStyle = {
    display: 'flex',
    flexDirection: 'column',
    justifyContent: 'center',
    alignItems: 'center',
    height: 'calc(100vh - 20px)',
    ':after': {
      content: `''`,
      display: 'block',
      position: 'absolute',
      top: '0',
      left: '0',
      width: '100%',
      height: '100%',
      backgroundImage: `url('images/background.jpg')`,
      backgroundRepeat: 'no-repeat',
      backgroundSize: 'cover',
      backgroundPosition: '50% 0',
      opacity: '0.35'
    }
  }
  
  export default class App extends PureComponent {
    render() {
      return (
        <Div css={appStyle}>
          <StatCalculator />
        </Div>
      );
    }
  }
  
subject: Fix trailing whitespace issue