table, th, td {
  border: 1px solid black;
  border-collapse: collapse;
  text-align: center;
}

a {
  color: black;
  background-color: transparent;
  text-decoration: none;
}

a:hover {
  color: black;
  background-color: transparent;
  text-decoration: none;
}

.card {
  margin-top: 40px;
  min-height: 260px;
}

.card-body {
  display: table-cell;
  vertical-align: middle;
  text-align: center;
}

code {
  color: #0d6efd;
  font-size: 120%;
}