.button {
  border: 2px solid #25a9e0;
  background: #25a9e0;
  color: #03111b;
}
.button:hover,
.button:focus {
  border-color: #075f8d;
  background: #075f8d;
  color: #fff;
}
.theme-toggle:hover {
  border-color: #25a9e0;
}
.button:focus-visible,
.theme-toggle:focus-visible,
a:focus-visible {
  outline: 3px solid #f2b84b;
  outline-offset: 3px;
}
[data-theme="light"] nav a {
  color: #354b5f;
}
[data-theme="dark"] nav a {
  color: #b9c8d6;
}