Slack Dark Theme custom CSS

custom.cs

:root {
     /* Modify these to change your theme colors: */
     --primary: #61AFEF;
     --text: #ABB2BF;
     --background: #282C34;
     --background-elevated: #3B4048;

     /* These should be less important: */
     --background-hover: lighten(#3B4048, 10%);
     --background-light: #AAA;
     --background-bright: #FFF;

     --border-dim: #666;
     --border-bright: var(--primary);

     --text-bright: #FFF;
     --text-dim: #555c69;
     --text-special: var(--primary);
     --text-accent: var(--text-bright);

     --scrollbar-background: #000;
     --scrollbar-border: var(--primary);

     --yellow: #fc0;
     --green: #98C379;
     --cyan: #56B6C2;
     --blue: #61AFEF;
     --purple: #C678DD;
     --red: #E06C75;
     --red2: #BE5046;
     --orange: #D19A66;
     --orange2: #E5707B;
     --gray: #3E4451;
     --silver: #9da5b4;
     --black: #21252b;
   }
   .c-team__display-name,
   .c-unified_member__display-name,
   .c-usergroup__handle,
   .c-member__name,
   .c-member__display-name {
     color: var(--primary) !important;
   }

https://github.com/mallowigi/slack-one-dark-theme