* {
  font-family: "Poppins", sans-serif;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.container {
  width: 100%;
  height: 100vh;
  background: url(img/back.jpg);
  background-position: center;
  background-size: cover;
}

.container h1 {
  color: #fff;
  font-size: 50px;
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
}

.inner-container {
  width: 100%;
  height: 100%;
  background: linear-gradient(
    135deg,
    rgba(0, 0, 0, 0.4) 0%,
    rgba(0, 0, 0, 0.4) 25%,
    rgba(0, 23, 149, 06) 50%,
    rgba(255, 0, 0, 0.6) 75%,
    rgba(0, 23, 149, 0.6) 100%
  );
  position: absolute;
  top: 0;
  left: 0;
  background-repeat: no-repeat;
  background-size: 400% 400%;
  transition: 2s;
}

.container:hover .inner-container {
  background-position: 100% 100%;
}