Hello Regis,

Thanks for reaching out.

From chrome debug the extra space is coming from the Next/Previous Post Navigation placeholder and the Comments container, which exist in the markup even when empty or hidden. Additionally, the main page container has default bottom padding that reveals the white background before your black footer section begins.

Please add this to Salient > General Settings > CSS/Script Related > Custom CSS Code and let us know how it goes:

body.single .blog_next_prev_buttons,
body.single .comment-wrap,
body.single .comments-section {
    display: none !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
}

/* Remove default bottom padding from the main container */
body.single .container-wrap,
body.single .container.main-content {
    padding-bottom: 0 !important;
}

Best wishes,