* {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-size: 16pt;
}

h1 {
  font-size: 2.4rem;
}

.fragment {
  opacity: 0;
  transition: .3s opacity ease-in-out;
}

.fragment.visible {
  opacity: 1;
}

@media screen {
  body {
    background: black;
    margin: 0;
    padding: 0;
  }

  section {
    display: contents;
  }

  article {
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    background: white;
    position: absolute;
    width: 100vw;
    height: 100vh;
  }

  article:target {
    display: flex;
  }
}