body {
    display: flex;
    justify-content: center;  /* tengah horizontal */
    align-items: center;      /* tengah vertikal */
    height: 100vh;
    margin: 0;
}
h1 {
    position: absolute;
    top: 20px;
}
.card {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    body {
  font-family: Arial;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 5px;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

input {
  padding: 10px;
  width: 150px;
  margin: 10px;
}

button {
  padding: 10px 10px;
  background: blue;
  color: white;
  border: none;
  cursor: pointer;
}
}