GitHub CSS

github.css

/**
 * This section makes it much easier to switch branches/forks when creating a pull request.
 * Instead of hiding the dropdowns after each selection, they're left visible, ready to be changed at a moment's notice.
 * I use StyleBot to persist these styles (https://chrome.google.com/webstore/detail/stylebot/oiaejidbmkiecgbjeifoejpgmdaleoha?hl=en)
 */
.range-editor .range .cross-repo-text {
    display: none;
}

.range-editor .range .select-menu.fork-suggester {
    display: inline-block;
}

.range-editor.for-collapsed {
    display: none;
}

.range-editor.for-expanded {
    display: block;
}