text: 
  const boxShadow3d = (offset, color) => {
    let css = ''
    for (let i = 1; i < offset + 1; i++) {
      css += `${i}px ${i}px 0px ${color}${(offset !== i) ? ', ' : ''}`
    }
    return css
  }
  
  export default boxShadow3d