@media (min-width:320px)  {
/* smartphones, iPhone, portrait 480x320 phones */
}

@media (min-width:481px)  {
/* portrait e-readers (Nook/Kindle), smaller tablets @ 600 or @ 640 wide. */
}

@media (min-width:641px)  {
/* portrait tablets, portrait iPad, landscape e-readers, landscape 800x480 or 854x480 phones */
}

@media (min-width:961px)  {
/* tablet, landscape iPad, lo-res laptops ands desktops */
}

@media (min-width:1025px) {
/* big landscape tablets, laptops, and desktops */
}

@media (min-width:1281px) {
/* hi-res laptops and desktops */
}