Settings.Carbon.yaml

Carbon:
  Notification:
    # These styles get applied to every notification
    default:
      color: '#fff'
      box-shadow: '0 1px 10px rgba(0,0,0,0.1)'
      padding: '5% 12px'
      margin: '30px auto'
      text-align: center
      text-decoration: none
      font-size: 20px

    # Set the special styles for the different types
    # You can also define your own types here
    types:
      alert:
        background: '#d9534f'
      warning:
        background: '#f0ad4e'
      info:
        background: '#5bc0de'
      success:
        background: '#00a338'
      backend:
        background: '#222'

    data:
      # This styles get applied to the data-carbon-* notification (Along with the others from above)
      default:
        width: 100%
        display: block
      # If the tag with the attribute data-carbon-* is not empty, these styles gets applied
      notEmpty:
        display: 'none !important'