Notion darker theme with fixed scrollbar sizes

notion.dark.css

@-moz-document domain("notion.so") {
::-webkit-scrollbar {
    width: 10px;
}


::-webkit-scrollbar-track {
    background: #414141;
}

::-webkit-scrollbar-thumb {
    background: #000;
    border-radius: 10px;
    ;
}


::-webkit-scrollbar-thumb:hover {
    background: #555;
}


}

@-moz-document domain("notion.so") {
/* Taken from userstyles https://userstyles.org/api/v1/styles/css/164504 */

#notion-app .notion-sidebar-container {
    background-color: #121212!important;
    color: #fff!important
}
#notion-app .notion-frame {
    background-color: #202020!important
}
#notion-app .notion-scroller > div:nth-child(1) {
    color: #eee!important
}
#notion-app > div > div > div.notion-sidebar-container > div:nth-child(1) > div:nth-child(2) > div > div:nth-child(1),
#notion-app > div > div > div.notion-sidebar-container > div:nth-child(1) > div:nth-child(2) > div > div:nth-child(5) > div:nth-child(1) > span > div > div > div:nth-child(2),
.notion-topbar {
    color: #fff!important;
    background-color: #121212!important
}
/* #notion-app .notion-scroller::-webkit-scrollbar {
    width: 5px;
}
#notion-app .notion-scroller::-webkit-scrollbar * {
    background: transparent;
}
#notion-app .notion-scroller::-webkit-scrollbar-thumb {
    background: rgba(47, 47, 47, .1) !important;
} */
#notion-app .notion-code-block {
    background: #1d1d1d;
}
#notion-app .notion-frame .notion-selectable a {
    background: rgb(43, 43, 43) !important;
}
}

Extended upon the existing style from UserStyles
Wayback link