@import url('https://fonts.googleapis.com/css2?family=Muli&display=swap');

* {
  box-sizing: border-box;
}

body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  margin: 0;
  font-family: Muli, sans-serif;
  background-color: #fbfcfe;
}

.container {
  width: min(95%, 768px);
  padding: 30px;
  text-align: center;
  background-color: #fff;
  border: 3px solid #000;
  border-radius: 10px;
}

.code-container {
  display: flex;
  margin: 40px 0;
  justify-content: center;
}

.code {
  width: 100px;
  height: 120px;
  margin: 1%;
  font-size: 75px;
  font-weight: 300;
  text-align: center;
  border: 1px solid #eee;
  border-radius: 5px;
  -moz-appearance: textfield;
  &::-webkit-outer-spin-button,
  &::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
  }
  &:valid {
    border-color: #3498db;
    box-shadow: 0 10px 10px -5px rgba(0, 0, 0, 0.25);
  }
}

.info {
  display: inline-block;
  max-width: 400px;
  padding: 10px;
  line-height: 20px;
  color: #777;
  background-color: #eaeaea;
  border-radius: 5px;
}

@media (width <= 600px) {
  .code-container {
    flex-wrap: wrap;
  }
  .code {
    height: 80px;
    max-width: 70px;
    font-size: 60px;
  }
}