style.css

html {
  position: relative;
  font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
  -ms-text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

html,
body {
  height: 100%;
  padding: 0;
  margin: 0;
}

main {
  border: 1px dotted grey;
  height: 100vh;
  margin: 0.2rem;
  display: flex;
  flex-direction: column;
}

main > div {
  flex-grow: 1;
  text-align: center;
}

header,
footer {
  text-align: center;
  margin: 0.2rem;
  border: 1px dotted red;
}

header {
  display: flex;
  justify-content: space-between;
  & ul {
    display: flex;
    & li {
      list-style: none;
      margin: 1rem;
    }
  }
}

#loading {
  position: fixed;
  font-family: sans-serif;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

#initializing {
  text-align: center;
}

#application {
  width: 100%;
}