Custom CSS to return Toot! button instead of Publish! in Mastodon v4 web UI

As a Mastodon instance admin you can insert custom CSS under Administration -> Server Settings in the Appearance tab.

Just copy & paste the following CSS in the Custom CSS box and set the content value to any string you want…

div.compose-form__publish-button-wrapper > button,
div.ui__header__links > a[href="/publish"] {
  text-indent: -9999px;
  line-height: 0;

div.compose-form__publish-button-wrapper > button::after,
div.ui__header__links > a[href="/publish"]::after {
  content: "T00t!";
  text-indent: 0;
  display: block;
  line-height: initial;

Click the button “Save changes” and refresh your page. The button has a custom text instead of the “Publish!” string.

And that’s it…

(Based on the following StackOverflow answer for more info –