img {
  max-width: 100%;
}

html,
body {
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

main {
  flex: 1 1 auto;
  justify-content: center;
  align-items: center;
  min-height: 100%;
  display: flex;
  flex-direction: column;
}

.main_block_page img {
  max-height: 500px;
}