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

:root {
  --color-back: #eee;
  --color-even: rgba(221, 221, 221, 0.151);
  --color-odd: rgba(187, 187, 187, 0.329);
  --color-sym: #5959c1;
  --color-num: #37ab00;
  --color-rest: #272727; }

html {
  box-sizing: border-box;
  font-size: 62.5%;
  font-family: 'Ubuntu', sans-serif;
  font-weight: 300; }

body {
  display: flex;
  flex-direction: column;
  max-height: 100vh;
  overflow: hidden; }

.container {
  height: 95vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem; }

.menu {
  display: flex;
  height: 5vh;
  background-color: var(--color-back);
  align-items: center;
  justify-content: center; }
  .menu__text {
    border: none;
    width: 30vh;
    height: 3vh;
    border-radius: 1rem;
    text-align: center; }
    .menu__text::placeholder {
      text-align: center;
      font-family: inherit; }
    .menu__text:active, .menu__text:focus {
      outline: none; }
  .menu__wrap {
    -webkit-appearance: none; }
    .menu__wrap:checked + label .icon-insert-template {
      fill: var(--color-num); }
  .menu__fullscreen {
    -webkit-appearance: none; }
    .menu__fullscreen:checked + label .icon-enlarge {
      fill: var(--color-num); }

.box {
  display: flex;
  flex-wrap: nowrap; }
  .box__letter {
    height: 30vw;
    width: 20vw;
    border: 0.2rem solid #888;
    margin: 0.5rem;
    flex: 1 1 15vh;
    box-shadow: 0 0 2rem rgba(0, 0, 0, 0.336);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 25vw; }
    .box__letter:nth-child(odd) {
      background-color: var(--color-odd); }
    .box__letter:nth-child(even) {
      background-color: var(--color-even); }
    .box__letter:first-child {
      border-top-left-radius: 10%;
      border-bottom-left-radius: 10%; }
    .box__letter:last-child {
      border-top-right-radius: 10%;
      border-bottom-right-radius: 10%; }

.number {
  color: var(--color-num); }

.symbol {
  color: var(--color-sym); }

.alpha {
  color: var(--color-rest); }

.icon {
  height: 3vh;
  width: 3vh;
  padding: 0.2rem;
  margin-left: 1rem;
  margin-right: 1rem; }

.icon-insert-template {
  fill: var(--color-rest); }

.icon-github {
  position: absolute;
  bottom: 1rem;
  right: 1rem; }