Cambios

/* Efecto Poemas */

.maincontainer{

width: auto;

height: auto;

/* THE CARD HOLDS THE FRONT AND BACK FACES */

.thecard{

top: 0;

left: 0;

/* THE FRONT FACE OF THE CARD, WHICH SHOWS BY DEFAULT */

.thefront{

top: 0;

left: 0;

/* THE BACK FACE OF THE CARD, WHICH SHOWS ON MOUSEOVER */

.theback{

top: 0;

left: 0;