._underscore {  padding-left: 1rem;   > h1, > h2, .header { margin-left: -1rem; }  > h2 { @extend %block-heading; }   .header {    display: inline-block;    vertical-align: top;    margin-bottom: 1em;  }   > p[id] { margin-top: 2rem; }  > pre { margin-top: 1em; }   .header + code {    margin-left: 1em;    @extend %label;  }   .alias {    margin-left: 1em;    font-style: italic;  }}