@wordpress/block-library/build-style/tabs-menu-item/editor.css

Block library for the WordPress editor.

.wp-block-tabs-menu-item.is-selected {
  outline: 2px solid var(--wp-admin-theme-color, #007cba);
  outline-offset: 2px;
}

.block-editor-block-preview__live-content:has(.wp-block-tabs-menu-item) {
  flex-basis: inherit !important;
  flex-grow: inherit !important;
}
.block-editor-block-preview__live-content:has(.wp-block-tabs-menu-item) .wp-block-tabs-menu-item {
  flex-basis: 100% !important;
}
.block-editor-block-preview__live-content:has(.wp-block-tabs-menu-item):hover > .wp-block-tabs-menu-item {
  background-color: var(--custom-tab-hover-color, #eaeaea) !important;
  color: var(--custom-tab-hover-text-color, #000) !important;
}