Support un/printable UI

[wcoder]

Problem places:

• code

Sample styles:

%unprintable {
  @media print {
    display: none !important;
    visibility: hidden;
  }
}

.unprintable { @extend %unprintable; }

%printable {
  @media not print  {
    display: none !important;
    visibility: hidden;
  }
}

.printable { @extend %printable; }


.header {
  @extend %unprintable;
 // ....
}