works with the library of alexandria (wip). use https://mybrowseraddon.com/custom-style-script.html not stylish. backgrounds are blocked now.

botsin.space.css

/**
 * @author aha <patagnome@protonmail.com>
 * @license wtfpl, version 2
 * @version 0.0.0-novel.0
 * @appliesTo URLsStartingWith https://masto.ai/
 * @source https://hachyderm.io/@rachelwilliams/109453512422406007
 * @source https://hachyderm.io/@rachelwilliams/109456125944527023
 * @note turn on `layout.css.has-selector.enabled` in firefox.
 */

@font-face {
    font-family: 'Eulexia';
    font-style: normal;
    font-weight: 400;
    src: local('Eulexia'), url('https://fonts.cdnfonts.com/s/59457/EulexiaRegular.woff') format('woff');
}
@font-face {
    font-family: 'Eulexia';
    font-style: normal;
    font-weight: 400;
    src: local('Eulexia'), url('https://fonts.cdnfonts.com/s/59457/EulexiaBold.woff') format('woff');
}
@font-face {
    font-family: 'Eulexia';
    font-style: italic;
    font-weight: 400;
    src: local('Eulexia'), url('https://fonts.cdnfonts.com/s/59457/EulexiaBoldItalic.woff') format('woff');
}
@font-face {
    font-family: 'Eulexia';
    font-style: italic;
    font-weight: 400;
    src: local('Eulexia'), url('https://fonts.cdnfonts.com/s/59457/EulexiaItalic.woff') format('woff');
}

html, body, *:not([class*="fa"]) {
    font-family: 'Eulexia', sans-serif !important;
}

p, a,
li, span, label, input, textarea,
h1, h2, h3, h4, h5, h6,
button, select, option,
div {
    text-shadow: -1px -1px 1px rgba(255,255,255,.1), 1px 1px 1px rgba(0,0,0,.5) !important;
}

.columns-area__panels__main {
    max-width: 57vw !important;
    max-width: 65vw !important;
    max-width: 84vw !important;
    max-width: 100vw !important
}

.columns-area__panels {
    justify-content: space-between !important;
}

.column-link.column-link--transparent i { 
}

.column-link.column-link--transparent span { 
}

.column > .scrollable {
    background: transparent !important;
}

body:before {
    background-image: url(https://black-mode.surge.sh/fc5f1febeb2f5f83.png) !important;
    background-repeat: no-repeat !important;
    background-size: 100% !important;
    width: 100%;
    height: 100%;
    content: ' ';
    display: block;
    z-index: -1;
    position: fixed;
    bottom: 0;
}

/* run backgrounds locally i guess `python3 -m http.server`. botsin.space still blocks them now because reasons, cors or whatever */
body:before {
    /*background-image: url(https://black-mode.surge.sh/97b6c51ddf48c0d0.png) !important;*/
    /*background-image: url(https://black-mode.surge.sh/tumblr_1b8cd67f6a9542cb27360bab5a34318e_4bc87e44_1280.jpg) !important;*/
    background-image: url(http://[::]:8000/tumblr_1b8cd67f6a9542cb27360bab5a34318e_4bc87e44_1280.jpg) !important;
    background-size: cover !important;
    background-position: bottom left !important;
}

body {
}

/**
 * @description combine at will on tumblr dot com.
 * @usage
 * (mix|background)-blend-mode: normal;
 * (mix|background)-blend-mode: multiply;
 * (mix|background)-blend-mode: screen;
 * (mix|background)-blend-mode: overlay;
 * (mix|background)-blend-mode: darken;
 * (mix|background)-blend-mode: lighten;
 * (mix|background)-blend-mode: color-dodge;
 * (mix|background)-blend-mode: color-burn;
 * (mix|background)-blend-mode: hard-light;
 * (mix|background)-blend-mode: soft-light;
 * (mix|background)-blend-mode: difference;
 * (mix|background)-blend-mode: exclusion;
 * (mix|background)-blend-mode: hue;
 * (mix|background)-blend-mode: saturation;
 * (mix|background)-blend-mode: color;
 * x|background)-blend-mode: luminosity;
 */
body {
/*
    mix-blend-mode: color-dodge !important;    
    mix-blend-mode: luminosity !important;  
    mix-blend-mode: multiply !important;      
    mix-blend-mode: exclusion !important; 
    mix-blend-mode: hard-light !important;      
    mix-blend-mode: soft-light !important;  
    mix-blend-mode: color-burn !important;     
    mix-blend-mode: lighten !important;           
    mix-blend-mode: darken !important;           
    mix-blend-mode: screen !important;   
    mix-blend-mode: overlay !important;  
    mix-blend-mode: difference !important;   */   
}

body:after {
    /*background-color: white !important; */      
}

[role="feed"] {
    background-color: transparent !important;
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: wrap  !important;
    justify-content: space-between  !important;
    align-items: baseline  !important;
    align-content: space-between !important;
}
[role="feed"]:after {
    content: '⎚ ⎚ ⎚' !important;
    margin-bottom: 2vw !important;
    display: block !important;
    position: relative !important;
    z-index: 9999 !important;
    color: rgba(255, 255, 255, 0.35) !important;
    transform: scale(3) !important;
    height: 100% !important;
    width: 100% !important;
    mix-blend-mode: luminosity !important;    
    text-align: center !important;
}

[role="feed"] > * {
    width: 49% !important;
    width: 33% !important;
    width: 25% !important;
    opacity: 0.45;
}

[role="feed"] > a:visited,
[role="feed"] > a:focus,
[role="feed"] > a:active,
[role="feed"] > a:hover {
    opacity: 1;
}

[role="feed"] > *:focus,
[role="feed"] > *:active,
[role="feed"] > *:hover {
    opacity: 1;
}

[role="feed"] > *:hover {
    background: radial-gradient(circle, transparent 20%, #fecb2f 20%, #fecb2f 80%, transparent 80%, transparent) 0% 0% / 74px 74px, radial-gradient(circle, transparent 20%, #fecb2f 20%, #fecb2f 80%, transparent 80%, transparent) 37px 37px / 74px 74px, linear-gradient(#ed8a12 8.5px, transparent 8.5px) 0px -4.25px / 37px 37px, linear-gradient(90deg, #ed8a12 8.5px, #fecb2f 8.5px) -4.25px 0px / 37px 37px #fecb2f  !important;
    background-color: #fecb2f !important;
}


[class="navigation-panel"] * * *,
[class="navigation-panel"] * *,
[class="navigation-panel"] * {
    background-image: none !important;
    background-color: #575b9c !important;
}

/* @description antimidas */
body div aside div { outline: 3px solid rgba(10, 10, 10, 0.1); }
body aside div aside { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div div aside { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body aside div div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div div div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body footer div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div footer { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div > div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div + div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body div + div + div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
body header + div { outline: 3px solid  rgba(10, 10, 10, 0.1); }
[data-id] { outline: 3px solid  rgba(10, 10, 10, 0.1); }

/* @description detection */
/*
body div aside div { border-radius: 100vw; }
body aside div aside { border-radius: 100vw; }
body div div aside { border-radius: 100vw; }
body aside div div { border-radius: 100vw; }
body div div div { border-radius: 100vw; }
body footer div { border-radius: 100vw; }
body div footer { border-radius: 100vw; }
body div > div { border-radius: 100vw; }
body div + div { border-radius: 100vw; }
body div + div + div { border-radius: 100vw; }
body header + div { border-radius: 100vw; }
[data-id] { border-radius: 100vw; }
*/

/* @description shadowplay */
body div aside div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body aside div aside { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div div aside { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body aside div div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div div div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body footer div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div footer { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div > div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div + div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body div + div + div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
body header + div { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
[data-id] { box-shadow: 0 0 0.2rem rgba(0, 0, 0, 0.1); }
[class="columns-area__panels__pane columns-area__panels__pane--start columns-area__panels__pane--navigational"] {
    width: auto !important;
    justify-content: flex-end !important;
}
[class="columns-area__panels__pane columns-area__panels__pane--start columns-area__panels__pane--navigational"] [class="columns-area__panels__pane__inner"] {
    width: auto !important;
    position: fixed !important;
    right: 0 !important;
    z-index: -1 !important;
}

[class="columns-area__panels__pane columns-area__panels__pane--start columns-area__panels__pane--navigational"] [class="columns-area__panels__pane__inner"]:has(a) {
    /*z-index: 9999 !important;*/
}

[class="columns-area__panels__pane columns-area__panels__pane--start columns-area__panels__pane--navigational"] [class="columns-area__panels__pane__inner"] div div {
    background-image: url(https://black-mode.surge.sh/Fb6hNw7WAAYp4h6.jpg) !important;
    background-blend-mode: luminosity !important;
    background-size: cover !important;
    background-repeat: no-repeat !important;
}

.column-link--transparent {}

a[class*="column-link"] { 
    background-color: transparent !important;
    opacity: 0.75 !important;
}

a[class*="column-link"] i,
a[class*="column-link"] span {
    background-color: transparent !important;
}

.ui__header,
.column-header,
.tabs-bar__wrapper {
    background-color: transparent !important;
}

.columns-area__panels__pane--navigational .navigation-panel {
    background-color: transparent !important;
}

[class="compose-form"] {
    opacity: 0.5 !important;
}
[class="compose-form"]:hover *,
[class="compose-form"]:active *,
[class="compose-form"]:focus *,
[class="compose-form"]:focus
[class="compose-form"]:active,
[class="compose-form"]:hover {
    opacity: 1 !important;
}
*:hover:has(*:hover),
*:focus:has(*:focus),
*:active:has(*:active),
*:has(*:hover),
*:has(*:focus),
*:has(*:active) {
    opacity: 1 !important;
    z-index: 9999 !important;
}
.columns-area__panels__main:has([class="tabs-bar__wrapper"]:hover) + div {
    z-index: -1 !important;
    outline: 3px solid gold !important;
} 
[class="columns-area__panels__main"]:hover + div {
    z-index: 9999 !important;
}
[class="tabs-bar__wrapper"]:hover + div {
    z-index: -1 !important;
}

[data-popper-reference-hidden="false"][data-popper-placement="bottom"][data-popper-escaped="true"] {
    z-index: 9999 !important;
}

.autosuggest-textarea__textarea:not(.autosuggest-textarea__textarea:target) { opacity: 1 !important; outline: 1px solid gold !important; }

.columns-area__panels__pane--compositional:has(.autosuggest-textarea__textarea:visible),
.columns-area__panels__pane--compositional:has(.autosuggest-textarea__textarea:focus-within),
.columns-area__panels__pane--compositional:has(.autosuggest-textarea__textarea:active),
.columns-area__panels__pane--compositional:has(.autosuggest-textarea__textarea:focus) {
    opacity: 1 !important;
}

/* EOF */