html, body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: Montserrat, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

#handsontable-container.handsontable {
  height: 100%;
}

.place-your-ad-here {
  position: fixed;
  top: 20px;
  border: 3px solid #126BCF;
  border-radius: 5px;
  color: #126BCF;
  font-weight: bold;
  padding: 10px 25px;
  text-align: center;
  line-height: 1.5;
}

.github-corner:hover .octo-arm { animation: octocat-wave 560ms ease-in-out; }

@keyframes octocat-wave {
  0%,
  100% { transform: rotate(0); }

  20%,
  60% { transform: rotate(-25deg); }

  40%,
  80% { transform: rotate(10deg); }
}

@media (max-width: 500px) {
  .github-corner:hover .octo-arm { animation: none; }
  .github-corner .octo-arm { animation: octocat-wave 560ms ease-in-out; }
}