Lemmy compact user theme extension - for litely or darkly.

lemmy-compact.css

/* Full width of page */
.home.container-lg, .navbar.container-lg, main > .post, .community.container-lg {
    max-width: 100% !important;
}

/* Hide text of post (helps compact lines) */
.col-sm-9 .text-body {
    display: none !important;
}

.col-sm-9 .post-title .text-body {
    display: inline !important;
}

/* Enlarge icon row */
.d-flex.align-items-center.justify-content-start.flex-wrap.text-muted
{
    transform: scale(1.2);
    margin-left: 9%;
}

/* No margin on main container top */
.mt-4.p-0.fl-1 {
    margin-top: 0rem !important;
}

/* Resize main column and side bar */
.d-none.d-md-block.col-md-4 {
    flex: 0 0 auto !important;
    width: 25% !important;
}
.col-md-8[role="main"], .community > .row > .col-md-8 {
    flex: 0 0 auto !important;
    width: 75% !important;
}

/* Hide avatars of users and communities on posts */
.person-listing > picture, .community-link > picture {
    display: none !important;
}

/* Comments - more offset between levels */
.comments ul.ms-1 {
    margin-left: 1rem !important;
}

.comment-node > div > div > div.md-div {
    margin-left: 0.5rem;
}