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HTML

              
                <div id="app"></div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Lato')

$default: #fff
$primary: #00b2d0
$secondary: #00c92b
$alert: #e53d00

=btn-color($color)
  &
    background: $color
    &:hover
      background: $color*.9
      box-shadow: 1px 1px 1px #333

.app
  width: 90%
  margin: 0 auto
  display: flex
  flex-direction: column
  justify-content: center
  font-family: 'Lato', sans-serif
  
.button
  margin: 0.5em
  padding: .5em 1.5em
  border: 1px solid #000
  color: #fff
  border-radius: 4px
  cursor: pointer
  transition: background .20s ease-in, box-shadow .20s ease-in
  text-transform: uppercase
  
  &--default
    +btn-color($default)
    color: #000
  &--primary
    +btn-color($primary)
  &--secondary
    +btn-color($secondary)
  &--alert
    +btn-color($alert)
  &--round
    border-radius: 50%
    padding: 1em
  &--disabled
    opacity: .3
    cursor: initial
    &:hover
      box-shadow: none
      
  &:active
    box-shadow: inset 1px 1px 1px #333    
  &:focus
    outline: none

.buttons-container
  display: flex
  flex-direction: column
  justify-items: center
  h2
    text-align: center
    
.buttons-wrapper
  display: grid
  justify-items: center
  width: 100%
  &.three-cols
    grid-template-columns: repeat(3,1fr)
  &.four-cols
    grid-template-columns: repeat(4,1fr)
  
              
            
!

JS

              
                class Button extends React.Component {
  static propTypes = {
    children: PropTypes.node.isRequired,
    color: PropTypes.string,
  }

  constructor(props){
    super(props)
  };
   
  render() {
    const {children,color,disable, round} = this.props
    
    const btnColorClass = (color ) ? `button--${color}` : 'button--default'
    const disabledClass = (disable) ? 'button--disabled' : ''
    const roundClass = (round) ? 'button--round' :  ''
    
    const btnClasses = `${btnColorClass} ${disabledClass} ${roundClass}`
    return (
      <button className={`button ${btnClasses}`} disabled={disable}>
        {children}
      </button>
    )
  }
}

const BtnContainer = ({title,colClass,children}) => {
  return(
    <div className='buttons-container'>
      <h2>{title}</h2>
      <div className={`buttons-wrapper  ${colClass}`}>
        {children}
      </div>
    </div>
  )
}

class App extends React.Component {

  render() {
    return (
      <div className="app">
        <BtnContainer title='Default Color Buttons' colClass='four-cols'>
          <Button>Ciao</Button>
          <Button color='primary' > Primary </Button>
          <Button color='secondary' > Secondary </Button>
          <Button color='alert' > Alert </Button>
          <Button disable>Ciao</Button>
          <Button color='primary' disable> Primary </Button>
          <Button color='secondary' disable> Secondary </Button>
          <Button color='alert' disable> Alert </Button>
        </BtnContainer>
        
        <BtnContainer title='Round Buttons' colClass='three-cols'>
          <Button color='primary' round > + </Button>
          <Button color='secondary' round > = </Button>
          <Button color='alert' round > - </Button>
          <Button color='primary' round disable> + </Button>
          <Button color='secondary' round disable> = </Button>
          <Button color='alert' round disable> - </Button>
        </BtnContainer>
        
        
      </div>
    )
  }
}

ReactDOM.render(<App/>,document.getElementById('app'))
              
            
!
999px

Console