.wp-block-intenseminimalism-sidenote {
  float: right;
  margin-left: 40px;
  width: calc( 50% - 40px );
}

.wp-block-intenseminimalism-sidenote:before {
  content: '';
  display: block;
  border-top: 4px solid rgba( 0, 0, 0, 1.0 );
  margin: 0 0 0.5em 0;
}