MyComp.jsx

import React from 'react'
import Select from 'react-styled-select'

class MyComp extends React.Component {
  render() {
    const options = [
      { label: "One", value: 1},
      { label: "Two", value: 2},
    ]
    return (
      <Select
        options={options}
        onOpen={myOpenFunc}
        onChange={myChangeFunc}
        className="my-root-class"
        classes={{
          selectValue: 'my-custom-class-value',
          selectArrow: 'my-custom-class-arrow'
        }}
      />
    )
  }
}