html { box-sizing: border-box; }

*,
*::before,
*::after { box-sizing: inherit; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Segoe UI", Arial, sans-serif;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}