html,
body,
.container {
  height: 100%;
  width: 100%;
}
.container {
  display: flex;
  align-items: center;
  justify-content: center;
}
.mydiv {
  width: 350px;
}

h1 {
    font-size: 50px;
    font-weight: bold;
    font-family: "Courier", cursive, sans-serif;
    color: #6A5ACD;
}
p {
    font-family: "Courier", cursive, sans-serif;
}
body {
    height: 100%;
    background: linear-gradient(0deg, #9370DB 10%, #FFFFFF 90%);
}