:root {
  --h1-font: "futura", sans-serif;
  --txt-color: yellow;
  --bg-color: black;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  border: 0;
  box-sizing: border-box;
}

html {
  -webkit-tap-highlight-color: var(--bg-color);
  -webkit-text-size-adjust: 100%;
}

body {
  position: relative;
  width: 100%;
  color: var(--txt-color);
  background-color: var(--bg-color);
}

html, body {
  height: 100%;
}

button,
input,
select,
textarea {
  font-size: inherit;
  font-family: inherit;
}

h1 {
  padding: 1rem 2rem;
  position: absolute;
  right: 0;
  bottom: 0;
  font-family: var(--h1-font);
}