.center {
  display: flex;
  justify-content: center;
  align-items: center;
    padding-left: 20px;
    padding-right: 20px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    font-size: 100%;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    body {
    background-color: black;
    color: lightgray;
    }
}

@media (prefers-color-scheme: light) {
    body {
        background-color: white;
        color: black;
    }
}

h1 {
    font-size: 8vw;
}

div {
    position: absolute;
    top: 0;
    bottom: 0;
    right: 0;
    left: 0;
}