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dark theme website

css var
dark theme
prefers-color-scheme

https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme

.day {
  background: #eee; color: black;
}
.night {
  background: #333; color: white;
}

@media (prefers-color-scheme: dark) {
  .day.dark-scheme   {
    background:  #333; color: white; 
  }
  .night.dark-scheme {
    background: black; color:  #ddd;
  }
}

@media (prefers-color-scheme: light) {
  .day.light-scheme   {
    background: white; color:  #555;
  }
  .night.light-scheme {
    background:  #eee; color: black;
  }
}

.day, .night {
  display: inline-block;
  padding: 1em;
   7em;
  height: 2em;
  vertical-align: middle;
}