mastodon/app/javascript/styles/mastodon/landing_strip.scss

.landing-strip,
.memoriam-strip {
  background: rgba(darken($ui-base-color, 7%), 0.8);
  color: $ui-primary-color;
  font-weight: 400;
  padding: 14px;
  border-radius: 4px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;

  strong,
  a {
    font-weight: 500;
  }

  a {
    color: inherit;
    text-decoration: underline;
  }

  .logo {
    width: 30px;
    height: 30px;
    flex: 0 0 auto;
    margin-right: 15px;
  }

  @media screen and (max-width: 740px) {
    margin-bottom: 0;
  }
}

.memoriam-strip {
  background: rgba($base-shadow-color, 0.7);
}