zmenšení/zvětšení obsahu podle velikosti obrazovky (moc nejede v IE)

/* ==|== media queries ======================================================
   PLACEHOLDER Media Queries for Responsive Design.
   These override the primary (‘mobile first’) styles
   Modify as content requires.
   ========================================================================== */

@media only screen and (min-width: 480px) {
  /* Style adjustments for viewports 480px and over go here */
}

@media only screen and (min-width: 768px) {
  /* Style adjustments for viewports 768px and over go here */
}