/* Flipping Effect for Navigation Bar Dropdowns */
nav ul{position:relative;}

nav ul a.main
{
  text-align:center; 
  text-decoration:none; 
  -webkit-transition:0.2s ease-in-out;
  -o-transition:0.2s ease-in-out;
  transition:0.2s ease-in-out;
  position:relative;
}

nav ul li ul
{
  -webkit-transform-origin:50% 0%;
  -o-transform-origin:50% 0%;
  transform-origin:50% 0%;
  -webkit-transform:perspective(350px) rotateX(-90deg);
  -o-transform:perspective(350px) rotateX(-90deg);
  transform:perspective(350px) rotateX(-90deg);
  -o-transition:0.2s linear 0s;
  transition:0.2s linear 0s;
  display:block;
}

nav ul li:hover ul
{
  -webkit-transform:perspective(350px) rotateX(0deg);
  -o-transform:perspective(350px) rotateX(0deg);
  transform:perspective(350px) rotateX(0deg);
  display:block;
}