body {
  display: grid;
  grid-gap: 30px;
  grid-template-columns: repeat(4, 1fr);
}

.sticky-container {
  box-shadow: 0 1px 1px 0 rgba(66, 66, 66, 0.08), 0 1px 3px 1px rgba(66, 66, 66, 0.16);
}

.content {
  position: relative;
  background-color: #fff;
  padding: 25px;
}

.sticky-item {
  position: sticky;
  top: 0;
  bottom: 0;
  background-color: #fff;
}
.sticky-item img {
  max-width: 100%;
}

.case-1 .content:first-child {
  z-index: 2;
}
.case-1 .sticky-item {
  z-index: 1;
}
.case-1 .content {
  background-color: #56bcf9;
}

.case-2 .sticky-item {
  z-index: 2;
}
.case-2 .content {
  background-color: #47cf73;
}

.case-3 .content {
  z-index: 2;
  background-color: #b9f;
}
.case-3 .sticky-item {
  z-index: 1;
}

.case-4 .content {
  background-color: #ffdd40;
}

* {
  box-sizing: border-box;
}

html {
  font-family: roboto;
}

body {
  margin: 30px;
}

h2 {
  position: sticky;
  top: 0;
  background-color: inherit;
  padding: 10px 0 10px 0;
  font-weight: 400;
  text-align: center;
}

p {
  font-size: 20px;
  color: #323232;
  font-weight: 300;
}

p + p {
  margin-top: 20px;
}

p, h2 {
  margin: 0;
}

img {
  display: block;
}

input {
  position: fixed;
  top: 20px;
  left: 15px;
  z-index: 11;
  display: block;
  padding: 5px;
  border: solid 1px rgba(136, 136, 136, 0.7);
  border-radius: 4px;
  background-color: rgba(255, 221, 64, 0.8);
  margin-right: 5px;
}

label {
  position: fixed;
  z-index: 10;
  left: 10px;
  top: 10px;
  display: block;
  padding: 10px;
  padding-left: 30px;
  border-radius: 4px;
  background-color: rgba(255, 221, 64, 0.8);
}

:checked ~ .sticky-container {
  position: relative;
  box-shadow: 0 0 0 2px #000;
}
:checked ~ .sticky-container > * {
  opacity: 0.8;
}