button {
  font-size:1rem;
}

a {
  text-decoration: none;
  color: inherit;
  display: inline-block;
  padding: 5px 5px;
  background-color: #dddddd;
  color: black;
  border: 1px solid black;
  border-radius: 4px;
}

img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  max-width: 50%;
}

table {
  margin-left:auto;
  margin-right:auto;
  margin-bottom:1rem;
}

h1, .center, code {
  text-align:center;
}