Sviaznoi

.screen {
  width: 250px ;
  height: 250px;
  border: 2px solid black;
  border-radius: 20px;
  transition: all 0.5s;
}

.gradient {
  background: linear-gradient(0deg, yellow 0%, red 50%, yellow 100%);
  background-size: 150%;
}

.gradient:hover {
  background-position-y: 40px;