style.css

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 0;
}
.settings {
  text-align: center;
  border-color: 1px;
  background-color: #eee;
  position: fixed;
  right: 0;
  bottom: 0;
  opacity: 0;
  transition: opacity 0.2s;
}
.settings:hover {
  opacity: 1;
}
.settings button {
  border: none;
  background: none;
  text-transform: capitalize;
  cursor: pointer;
  transition: opacity 0.2s;
}
.settings button:hover {
  opacity: 0.6;
}
.settings .modes button {
  font-size: 2rem;
}
.light {
  color: rgba(0, 0, 0, 0.9);
  background-color: #ffffff !important;
}
.dark {
  color: rgba(255, 255, 255, 0.9);
  background-color: rgb(47, 52, 55) !important;
}
/* Hide offscreen */
.dark #light {
  position: absolute;
  top: -5000px;
}
.light #dark {
  position: absolute;
  top: -5000px;
}