如何编写我自己的自定义 CSS 使用<amplifys3image />来自“@aws-amplify/ui-react”？

Question

const ImageFiles = ({className, imgKey}) => { const [imageLoading, setImageLoading] = useState(true);

  const triggerOnLoad = (value)=> {
            setImageLoading(value);
   }
        
  return (
   <div className="image_files_container">
              {imageLoading && (
                <span className="image_loader_block">
                  <LoaderBig className="image_loader loader_msgList" loading={true} position="center" />
                </span>
              )}
              <AmplifyS3Image
                className={className}
                imgKey={imgKey}
                handleOnLoad={() => triggerOnLoad(false)}
              />
            </div>
          );
        }
   `amplify-s3-image {
      --height: 300px;
      --width: 90%;
    }`