[Deff]

across,

Добавьте

<style>
.product_image img{
   transition-duration: 0.6s;
  -webkit-transition-duration: 0.6s;
  -moz-transition-duration: 0.6s;
  -o-transition-duration: 0.6s;
  -ms-transition-duration: 0.6s; /* IE9+ */
}   
</style>