html,
body,
main {
  height: 100%;
  width: 100%;
  margin: 0;
  overflow: hidden;
}
main {
  display: flex;
  align-items: center;
  justify-content: center;
}
canvas {
  height: auto !important;
  width: auto !important;
  max-width: 100% !important;
  max-height: 100% !important;
}
#mess {
  display: table;
  width: 100%;
  height: 90%;
  text-align: center;
}
#child {
  display: table-cell;
  vertical-align: middle;
  font-family: Century Gothic, CenturyGothic, AppleGothic, sans-serif;
  font-size: 1em;
  letter-spacing: 0.5rem;
  text-align: center;
  color: black;
}