%simple {  padding-left: 1rem;   h1, h2, h3 { margin-left: -1rem; }  h2 { @extend %block-heading; }  h3 { @extend %block-label, %label-blue; }  h4 { font-size: inherit; }   ._mobile & {    padding-left: 0;     h1, h2, h3 { margin-left: 0; }  }   p > code, li > code, td > code, blockquote > code, dd > code { @extend %label; }  blockquote { @extend %note; }  blockquote > h4, blockquote > h5 { margin-top: .25rem; }} ._simple { @extend %simple; }