* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: none;
  font-family: sans-serif;
}

input[type="checkbox"] {
  position: fixed;
  z-index: 1;
  top: 40px;
  right: 100px;
  cursor: pointer;
  -webkit-appearance: none;
}

input[type="checkbox"]:before {
  position: absolute;
  content: "Dark";
  color: #fff;
  background: #000;
  padding: 10px 20px;
}

input[type="checkbox"]:checked:before {
  content: "Light";
  color: #000;
  background: #fff;
}

input[type="checkbox"]:checked ~ * {
  filter: invert(1);
}

section {
  position: absolute;
  top: 0;
  left: 0;
  background: #fff;
  min-height: 100vh;
  padding: 80px 100px;
}

img {
  max-width: 500px;
  float: left;
  margin: 10px 20px 10px 0;
  filter: inherit;
}