src/theme/AnnouncementBar/styles.module.css

:root {
    --docusaurus-announcement-bar-height: auto;
}

.announcementBar {
    display: flex;
    align-items: center;
    height: var(--docusaurus-announcement-bar-height);
    background: linear-gradient(0deg, rgba(247, 249, 254, 0.8) 0%, rgba(247, 249, 254, 0.8) 100%), #fff;
    color: var(--ifm-color-black);

    /*
  Unfortunately we can't make announcement bar render above the navbar
  IE need to use border-bottom instead of shadow
  See https://github.com/facebookincubator/infima/issues/275

  box-shadow: var(--ifm-global-shadow-lw);
  z-index: calc(var(--ifm-z-index-fixed) + 1);
  */
    border-bottom: 1px solid var(--ifm-color-emphasis-100);
}

html[data-announcement-bar-initially-dismissed='true'] .announcementBar {
    display: none;
}

.announcementBarPlaceholder {
    flex: 0 0 10px;
}

.announcementBarClose {
    flex: 0 0 30px;
    align-self: stretch;
}

.announcementBarContent {
    flex: 1 1 auto;
}

.announcementBarContent:hover p {
    text-decoration: underline !important;
}

.announcementBarContent > a:active {
    background: linear-gradient(0deg, rgba(247, 249, 254, 0.8) 0%, rgba(247, 249, 254, 0.8) 100%), #fff !important;
}

@media print {
    .announcementBar {
        display: none;
    }
}

@media (min-width: 997px) {
    :root {
        --docusaurus-announcement-bar-height: 40px;
    }

    .announcementBarPlaceholder,
    .announcementBarClose {
        flex-basis: 50px;
    }
}