/* https://dev.to/lennythedev/css-gotcha-how-to-fill-page-with-a-div-270j */

/* override browser default */
html,
body {
  margin: 0;
  padding: 0;
}

/* use viewport-relative units to cover page fully */
body {
  height: 100vh;
  width: 100vw;
}

/* include border and padding in element width and height */
* {
  box-sizing: border-box;
}

/* full-sized  container that fills up the page */
.container-outer {
  height: 100%;
  width: 100%;

  padding: 10px;

  display: flex;
  flex-direction: column;
  align-items: center;
}

.container-outer > h1 {
  text-align: center;
}

.container {
  flex-grow: 1;

  padding-top: 5em;
  padding-bottom: 1em;

  display: flex;
  flex-direction: column;
  align-items: center;
}

#output {
  overflow-wrap: anywhere;
}

.container-buttons {
  margin-top: 1em;
  display: none;
}