html,
body {
  height: 100%;
}

.mobile-screen {
  max-width: 420px;
  margin: auto;
  padding: 1rem;
  background-color: #fff;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: center;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}