* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
}

html {
  margin: 0;
  padding: 0;
  font-size: 16px;
  line-height: 24px;
  font-family: sans-serif;
}

body {
  display: flex;
  min-height: 100%;
  margin: 0;
  padding: 1.5rem;
  justify-content: center;
  align-items: center;
}

#screen-initial,
#screen-scanning {
  display: block;
  width: 100%;
  height: 100%;
}

/* Rules for better readability */
img {
  display: block;
  width: 100%;
  max-width: 320px;
  height: auto;
}

video {
  width: 100%;
  height: 100%;
}

textarea {
  display: block;
}

/* Camera feedback */
#screen-scanning {
  position: relative;
}

#camera-feedback {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;

  width: 100%;
  height: 100%;
}

#camera-guides {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  text-align: center;
  font-weight: bold;
}

/* Auxiliary classes */
.hidden {
  display: none !important;
}