gpt4free-huggingface/styles.css

:root {
  --bslib-sidebar-main-bg: #f8f8f8;
}

.popover {
  --bs-popover-header-bg: #222;
  --bs-popover-header-color: #fff;
}

.popover .btn-close {
  filter: var(--bs-btn-close-white-filter);
}