body {background-color: #ddd; margin: 3rem;}

#tv {
  position: relative;
  width: 350px;
  height: 250px;
  background: white;
  border-radius: 0% 0% 0% 0% / 0% 0% 0% 0% ;
  color: white;
  box-shadow: 20px 20px rgba(0,0,0,.15);
  transition: all .4s ease;
}
#tv:hover {
  border-radius: 0% 0% 50% 50% / 0% 0% 5% 5% ;
  box-shadow: 10px 10px rgba(0,0,0,.25);
}