style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

main {
  display: flex;
  height: 100vh;
  width: 100vw;
  background-image: linear-gradient(
    to bottom right,
    #4affde 0%,
    #5b9dff 40%,
    #ff34d2 100%
  );
  background-size: 200% 200%;
  animation: movingGradient 5s linear infinite alternate;
}

body {
  overflow: hidden;
}

.login-card {
  height: 20vh;
  width: 85vw;
  margin: auto;
  text-align: center;
}

.login-card h3 {
  font-family: "Poppins", sans-serif;
  color: #f4f4f4;
}

.login-card button {
  font-family: "Poppins", sans-serif;
  font-style: initial;
  font-weight: 600;
  font-size: 20px;
  background: transparent;
  border: #f4f4f4 1px solid;
  border-radius: 10px;
  margin: 15px;
  padding: 12px;
  color: aliceblue;
  transition: all 0.5s ease;
}

.login-card button:hover {
  cursor: pointer;
  background: rgba(80, 29, 29, 0.13);
}

@keyframes movingGradient {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 100% 100%;
  }
}