#R-body-inner > .flex-block-wrapper article h1 {

  /* The theme sets it to 2.5rem.
    You can make it smaller. Try 2.0rem or 1.8rem.
    'rem' is a relative unit, so '1rem' is the base font size.
  */
  font-size: 1.8rem;
}

.navbar-brand img {
  height: 40px !important;
  width: auto !important;
}