>>/2973/
I'm using Default/Tomorrow as a base i believe


/* Post styling */
.innerPost, .markedPost {
    border-radius: 2px;
    background-color: #2F343ED0;
    padding-right: 12px;
}
/* Post (reply) previews */
.de-pview {
    border-radius: 2px;
    background-color: #1D1D21EE;
}
/* > */
.greenText {
    color: #9FBE75;
}

/* Background */
body { 
  background: url(https://i.imgur.com/BiOlhRw.jpeg) no-repeat center center fixed !important; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

/* Anchor reply form to top right */
form.form-post {
    position: fixed;
    top: 20px;
    right: 16px;
    background: #2F343ED0;
    padding: 8px !important;
    border-radius: 2px
}

/* Hide padding on top of reply form */
div.hField {
    display: none;
}

/* Hide manage board, moderate thread links (may not work on older? FF) */
p:has(a#linkManagement) {
    display: none;
}

/* Hide nav links under reply form */
p.topNav {
    display: none;
}

/* Hide close reply form button */
div.de-parea > div:first-of-type {
    display: none;
}

/* Bottom nav - align to right and hide reply button */
p.bottomNav {
    text-align: right;
}
a.replyLink {
    display: none;
}


/* Content action form (delete/report) */
/* anchor to bottom right of screen, hide content by default, show on hover */
div.contentAction {
    position: fixed;
    bottom: 16px;
    right: 8px;
    min-width: 64px;
    min-height: 8px;
    padding: 8px !important;
    border-radius: 2px;
    background: #2F343ED0;
}
div.contentAction > * {
    display: none;
}
div.contentAction:hover > * {
    display: block;
}