CSS> (let ((*print-case* :downcase)) (foo))
"@media print, screen and (min-width: 300px)
{
  h1.fancy:has(.blah), h2
  {
    font-family: 'Helvetica', sans-serif;
    color: red;
    color: \\#fff;
    border: 1px solid black;
    margin: 1em 1ex;
    shape-outside: polygon(0 100%, 0 100%);
    shape-outside: polygon(0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%);
  }
  h3, h4
  {
    padding: 1em 1ex;
    text-shadow: -1px -1px 0 black,
                 -1px 1px 0 black,
                 1px 1px 0 black,
                 -1px -1px 0 black,
                 -1px 1px 0 black,
                 1px 1px 0 black,
                 -1px -1px 0 black,
                 -1px 1px 0 black,
                 1px 1px 0 black,
                 -1px -1px 0 black,
                 -1px 1px 0 black,
                 1px 1px 0 black;
    color: rgb(100, 160, 200);
  }
}"
CSS> (foo)
"@MEDIA PRINT, SCREEN AND (MIN-WIDTH: 300PX)
{
  H1.FANCY:HAS(.BLAH), H2
  {
    FONT-FAMILY: 'Helvetica', SANS-SERIF;
    COLOR: RED;
    COLOR: \\#FFF;
    BORDER: 1PX SOLID BLACK;
    MARGIN: 1EM 1EX;
    SHAPE-OUTSIDE: POLYGON(0 100%, 0 100%);
    SHAPE-OUTSIDE: POLYGON(0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%,
                           0 100%);
  }
  H3, H4
  {
    PADDING: 1EM 1EX;
    TEXT-SHADOW: -1PX -1PX 0 BLACK,
                 -1PX 1PX 0 BLACK,
                 1PX 1PX 0 BLACK,
                 -1PX -1PX 0 BLACK,
                 -1PX 1PX 0 BLACK,
                 1PX 1PX 0 BLACK,
                 -1PX -1PX 0 BLACK,
                 -1PX 1PX 0 BLACK,
                 1PX 1PX 0 BLACK,
                 -1PX -1PX 0 BLACK,
                 -1PX 1PX 0 BLACK,
                 1PX 1PX 0 BLACK;
    COLOR: RGB(100, 160, 200);
  }
}"
CSS> (let ((*print-pretty* nil)) (foo))
"@MEDIA PRINT, SCREEN AND (MIN-WIDTH: 300PX){ H1.FANCY:HAS(.BLAH), H2{ FONT-FAMILY: 'Helvetica', SANS-SERIF;COLOR: RED;COLOR: \\#FFF;BORDER: 1PX SOLID BLACK;MARGIN: 1EM 1EX;SHAPE-OUTSIDE: POLYGON(0 100%, 0 100%);SHAPE-OUTSIDE: POLYGON(0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%, 0 100%);}H3, H4{ PADDING: 1EM 1EX;TEXT-SHADOW: -1PX -1PX 0 BLACK, -1PX 1PX 0 BLACK, 1PX 1PX 0 BLACK, -1PX -1PX 0 BLACK, -1PX 1PX 0 BLACK, 1PX 1PX 0 BLACK, -1PX -1PX 0 BLACK, -1PX 1PX 0 BLACK, 1PX 1PX 0 BLACK, -1PX -1PX 0 BLACK, -1PX 1PX 0 BLACK, 1PX 1PX 0 BLACK;COLOR: RGB(100, 160, 200);}}"
CSS>