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You can try:

1. Setting your column gutter to 0
2. Setting your padding to 0
3. Adding this CSS:

#wpsp-86.wpsp-card .wp-show-posts-single .wp-show-posts-image:after {
    content: "";
    box-shadow: inset 20px 0px 25px -11px rgba(0,0,0,0.3);
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

#wpsp-86.wpsp-card .wp-show-posts-entry-header {
    background: rgba(255,255,255,0.3);
    padding: 50px;
}