Heading with emphasized underline

Thumbnail

PugSCSS
h1.uk-text-primary.heading-small.text-bold.heading-underline(style='line-height:1;')
  span Section Title
.heading-underline {
  padding-bottom: 15px;
  border-bottom: 1px solid #d0d0d0;
  span {
    position: relative;
    font-weight: bold;
    letter-spacing: 2px;
    &:after {
      content: '';
      @include pos-a('','',-12px,0,120%,6px,5);
      background-color: $global-secondary-background;
    }
  }
}