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.light-bulb-toggle {
  display: block;
  margin-bottom: 1.5em;
  font-size: 1em;
  background-color: rgba(0,0,0,0.7);
  border-radius: 0.75em;
  -webkit-box-shadow: 0.125em 0.125em 0 0.125em rgba(0,0,0,0.3) inset;
  box-shadow: 0.125em 0.125em 0 0.125em rgba(0,0,0,0.3) inset;
  color: #fdea7b;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  margin: auto;
  padding: 0.15em;
  width: 3em;
  height: 1.5em;
  -webkit-transition: background-color 0.1s 0.3s ease-out, -webkit-box-shadow 0.1s 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, -webkit-box-shadow 0.1s 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, box-shadow 0.1s 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, box-shadow 0.1s 0.3s ease-out, -webkit-box-shadow 0.1s 0.3s ease-out;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.light-bulb-toggle:before, .light-bulb-toggle:after {
  content: "";
  display: block;
}

.light-bulb-toggle:before {
  background-color: #d7d7d7;
  border-radius: 50%;
  width: 1.2em;
  height: 1.2em;
  -webkit-transition: background-color 0.1s 0.3s ease-out, -webkit-transform 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, -webkit-transform 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, transform 0.3s ease-out;
  transition: background-color 0.1s 0.3s ease-out, transform 0.3s ease-out, -webkit-transform 0.3s ease-out;
  z-index: 1;
}

.light-bulb-toggle:after {
  background: -webkit-gradient(linear, left top, left bottom, color-stop(50%, transparent), color-stop(0, rgba(0,0,0,0.15))) 0 50% / 50% 100%,
		repeating-linear-gradient(90deg,#bbb 0,#bbb,#bbb 20%,#999 20%,#999 40%) 0 50% / 50% 100%,
		radial-gradient(circle at 50% 50%,#888 25%, transparent 26%);
  background: linear-gradient(transparent 50%, rgba(0,0,0,0.15) 0) 0 50% / 50% 100%,
		repeating-linear-gradient(90deg,#bbb 0,#bbb,#bbb 20%,#999 20%,#999 40%) 0 50% / 50% 100%,
		radial-gradient(circle at 50% 50%,#888 25%, transparent 26%);
  background-repeat: no-repeat;
  border: 0.25em solid transparent;
  border-left: 0.4em solid #d8d8d8;
  border-right: 0 solid transparent;
  -webkit-transition: border-left-color 0.1s 0.3s ease-out, -webkit-transform 0.3s ease-out;
  transition: border-left-color 0.1s 0.3s ease-out, -webkit-transform 0.3s ease-out;
  transition: border-left-color 0.1s 0.3s ease-out, transform 0.3s ease-out;
  transition: border-left-color 0.1s 0.3s ease-out, transform 0.3s ease-out, -webkit-transform 0.3s ease-out;
  -webkit-transform: translateX(-22.5%);
  -ms-transform: translateX(-22.5%);
  transform: translateX(-22.5%);
  -webkit-transform-origin: 25% 50%;
  -ms-transform-origin: 25% 50%;
  transform-origin: 25% 50%;
  width: 1.2em;
  height: 1em;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

.light-bulb-toggle:checked {
  background-color: rgba(0,0,0,0.45);
  -webkit-box-shadow: 0.125em 0.125em 0 0.125em rgba(0,0,0,0.1) inset;
  box-shadow: 0.125em 0.125em 0 0.125em rgba(0,0,0,0.1) inset;
}

.light-bulb-toggle:checked:before {
  background-color: currentColor;
  -webkit-transform: translateX(125%);
  -ms-transform: translateX(125%);
  transform: translateX(125%)
}

.light-bulb-toggle:checked:after {
  border-left-color: currentColor;
  -webkit-transform: translateX(-2.5%) rotateY(180deg);
  transform: translateX(-2.5%) rotateY(180deg);
}

.light-bulb-toggle:focus {
  outline: 0;
}

Light Bulb Toggle Switch

This light bulb switch is a very clever way of creating a light and dark mode toggle with CSS. When light mode is on, the light bulb will light up; otherwise, it will be off.

You can change the color of the light bulb by modifying background-color on CSS line 35 for off-color and line 9 for on-color.