#switch-theme-button:hover {
  border: 0px dotted green;
}

@media (prefers-color-scheme: dark) {
  :root {
     data-theme: "dark";
  }
}

@media (prefers-color-scheme: light) {
  :root {
     data-theme: "light";
  }
}

html[data-theme=dark] #switch-theme-icon-day {
  display: none;
}

html[data-theme=light] #switch-theme-icon-night {
  display: none;
}