.button {
  border-radius: 20px;
  color: #000000;
  background-color: #304a5f;
  border: 3px solid #000000;
  padding: 8px 20px;
  text-align: center;
  font-size: 16px;
  margin: 4px 2px;
  text-decoration: none;
  display: inline-block;
  opacity: 1.0;
  transition: 0.3s;
}
a:link {
  color: white;
}

/* visited link */
a:visited {
  color: white;
}

/* mouse over link */
a:hover {
  color: white;
}

/* selected link */
a:active {
  color: white;
}