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

:root {
  box-sizing: border-box;
  height: 100vh;
}

body {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
  font-size: calc(1vw + 1em);
  background-color: tan;
}

header, main {
  margin: 0 auto;
  width: 30em;
  padding: 1rem;
}

h2 {
  margin-top: 0.5em;
}

input[type="text"] {
  width: 100%;
  font-size: inherit;
  padding: 0.25em;
}