@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;
  width: 7em;
  height: 2em;
  vertical-align: middle;
}

Source: developer.mozilla.org

Similar codes

179 votes544 views6 answers
Filter method
CSS
0 vote315 views2 answers
How to change jumbotron size
CSS
1 vote348 views1 answer
Ul remove dots
CSS
0 vote324 views1 answer
Add css class c#
CSS
1 vote307 views1 answer
Spaces between letters css
CSS
0 vote328 views1 answer
Divi submenu collapse by default
CSS
0 vote323 views1 answer
Delete files with help of .getignore
CSS
7 votes363 views3 answers
Bootstrap remove outline
CSS Bootstrap
21 votes354 views2 answers
Ul css in one line
CSS
0 vote309 views1 answer
Css buchstaben auseinander weite
CSS