How do I remove the black shadow on the slider widget that is at the bottom of the image?

To remove the black shadow on the slider in the DW Focus. Please follow the jetpack’s guideline in the Blog article on how to use Edit CSS here. http://designwall.com/blog/using-jetpack-custom-css-for-your-wordpress-site/
After that, just add the following code to the Edit Css.

.news-slider .carousel .carousel-inner .entry-thumbnail:before {
    background: none;
}

Regards,