body {
  height: 100%;
}

#mainContainer {
  max-width: 50em;
  min-height: 100%;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.block-button {
  width: inherit;
  display: block;
  margin: 0.33em 0;
  padding: 0.5em;
  color: #fff;
  background-color: #2196F3;
  outline: none;
  border: none;
  border-radius: 0.3em;
  font-size: 2em;
  font-weight: bold;
  text-align: center;
  text-decoration: none !important;
  text-shadow: 0 0 0.5em #666;
  cursor: pointer;
}

@media screen and (max-width: 600px) {
  .block-button {
    font-size: 1.3em;
  }
}

.block-button:hover {
  background-color: #42A5F5;
}