.black-button:link,
.black-button:visited {
  background-color: black;
  color: white;
  padding: 14px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
.black-button:hover,
.black-button:active {
  background-color: rgba(0, 0, 0, 0.521);
}

.blue-button:link,
.blue-button:visited {
  background-color: rgb(0, 0, 197);
  color: white;
  padding: 14px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

.blue-button:hover,
.blue-button:active {
  background-color: rgba(0, 0, 197, 0.521);
}
.button-row {
    text-align: center;
}