carbon/components/Overlay.js

const Overlay = props => (
  <div className="dnd-container">
    {props.isOver ? <div className="dnd-overlay">{props.title}</div> : null}
    {props.children}
    <style jsx>{`
      .dnd-container {
        position: relative;
      }

      .dnd-overlay {
        display: flex;
        align-items: center;
        justify-content: center;
        text-align: center;
        width: 100%;
        height: 100%;
        z-index: 999;
        position: absolute;
        top: 0;
        left: 0;
        background: rgba(0, 0, 0, 0.85);
      }
    `}</style>
  </div>
)

export default Overlay