canvas[id=memo_4x4] 
{
  position: relative;
  margin:auto; 
  overflow: hidden;
  background-repeat:no-repeat;

  /*background: -moz-linear-gradient(180deg, #afe1f4, #fff 50%,  #afe1f4);
  background: -webkit-linear-gradient(180deg, #afe1f4, #fff 50%,  #afe1f4);
  background: -o-linear-gradient(180deg, #afe1f4, #fff 50%,  #afe1f4);
  background: -ms-linear-gradient(180deg, #afe1f4, #fff 50%,  #afe1f4);        */
  border: 0px solid #333;

}