<input type="checkbox" id="invert"><label for="invert"></label>
<input type="checkbox" id="sepia"><label for="sepia"></label>
<div class="content">
  <div class='film'>
    <div class="effect">
      <div class="grain"></div>
    </div>
  </div>
</div>

/*** 
unsplash.com API has changed
random images don't work like they used to
a still image has been posted
until I can investigate the new API

------------------------------------

The random image on unsplash.com works again as before. 
I leave it activated again.

------------------------------------

unsplash.com API fails again, I change the image for another one from Lorem Picsum

***/

:root {
  --trsn: all 0.5s ease 0s;
  --black: #000;
}

*, *:before, *:after {
  position: absolute;
}

body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--black);
  perspective: 100vmin;
}

.content {
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url(https://images.unsplash.com/photo-1454496522488-7a8e488e8606?ixlib&auto=format&fit=crop&w=1800&q=80) no-repeat center center;
  background: url(https://source.unsplash.com/random/800x600/?mountain) no-repeat center center;
  background: url(https://picsum.photos/800/600/) no-repeat center center;
  
  
  
  background-size: cover;
  transition: var(--trsn);
}

.content:before {
  content: "BG IMAGES FROM UNSPLASH.COM";
  font-family: Arial, Helvetica, serif;
  bottom: 0vmin;
  font-weight: 500;
  font-size: 1.35vmin;
  color: #fffD;
  border-radius: 1px;
  padding: 20vmin 2vmin 3vmin;
  letter-spacing: 0.5px;
  word-spacing: 3px;
  background: linear-gradient(0deg, black, transparent);
  width: 100%;
  text-align: center;
}

.content:after {
  content: "";
  width: 100%;
  height: 100%;
  box-shadow: 0 0 20vmin 0vmin var(--black) inset, 0 0 3vmin 0.5vmin var(--black) inset, 0 0 1vmin 1vmin var(--black);
}

.film, .effect {
  width: 100%;
  height: 100%;
  filter: blur(0.45px) drop-shadow(0px 0px 0px #fff1);
}

.film:after, .effect:after {
  content: '';
  width: 120%;
  height: 100%;
  top: 0;
  left: 0;
  padding-left: 100px;
  opacity: 0.5;
  animation: film-scratch 0.45s steps(1) infinite;
  background: repeating-linear-gradient(90deg, #0002 0 2px, transparent 4px 37vmin);
}

.effect:after {
  left: 30%;
  animation: effect-scratch 2s infinite;
}

.grain {
  width: 100%;
  height: 100%;
}

.grain:after {
  content: '';
  width: 110%;
  height: 110%;
  top: -5%;
  left: -5%;
  opacity: .25;
  background-image: 
    repeating-conic-gradient(var(--black) 0%, transparent .00003%, transparent .0005%, transparent .00095%),
    repeating-conic-gradient(var(--black) 0%, transparent .00005%, transparent 0.00015%, transparent 0.0009%);
  animation: grain 0.5s steps(1) infinite;
  filter: drop-shadow(0px 0px 1px black);
}

@keyframes grain {
  0%, 100% { transform: translate(0, 0); }
  10% { transform: translate(-1%, -1%); }
  20% { transform: translate(1%, 1%); }
  30% { transform: translate(-2%, -2%); }
  40% { transform: translate(3%, 3%); }
  50% { transform: translate(-3%, -3%); }
  60% { transform: translate(4%, 4%); }
  70% { transform: translate(-4%, -4%); }
  80% { transform: translate(2%, 2%); }
  90% { transform: translate(-3%, -3%); }
}

@keyframes film-scratch {
  0%, 100% { transform: translateX(0); opacity: 0.5; }
  10% { transform: translateX(-1%); }
  20% { transform: translateX(1%); }
  30% { transform: translateX(-2%); opacity: 0.75; }
  40% { transform: translateX(3%); }
  50% { transform: translateX(-3%); opacity: 0.5; }
  60% { transform: translateX(8%); }
  70% { transform: translateX(-3%); }
  80% { transform: translateX(10%); opacity: 0.25; }
  90% { transform: translateX(-2%); }
}

@keyframes effect-scratch {
  0% { transform: translateX(0); opacity: 0.75; }
  10% { transform: translateX(-1%); }
  20% { transform: translateX(1%); }
  30% { transform: translateX(-2%); }
  40% { transform: translateX(3%); }
  50% { transform: translateX(-3%); opacity: 0.5; }
  60% { transform: translateX(8%); }
  70% { transform: translateX(-3%); }
  80% { transform: translateX(10%); opacity: 0.25; }
  90% { transform: translateX(20%); }
  100% { transform: translateX(30%); }
}

/**** OLD FILM EFFECT END ****/






/*** OPTIONS ***/

@property --pos {
  syntax: '<percentage>';
  inherits: false;
  initial-value: 20%;
}

input {
  display: none;
}

label {
  position: absolute;
  background: #0008;
  bottom: 7vmin;
  z-index: 3;
  width: 12vmin;
  height: 5vmin;
  margin-left: 15vmin;
  border-radius: 5vmin;
  cursor: pointer;
  border-bottom: 1px solid #fff4;
  border-top: 1px solid var(--black);
}

label[for=invert] {
  margin-left: -15vmin;
}

label:before {
  width: 4vmin;
  height: 4vmin;
  background: #485637;
  content: "";
  border-radius: 100%;
  box-sizing: border-box;
  top: 0.5vmin;
  left: 0.75vmin;
  box-shadow: 2px 0px 4px 0px #000c;
}

label:after {
  font-family: Arial, Helvetica, serif;
  font-weight: 500;
  font-size: 1.25vmin;
  border-radius: 1px;
  content: "SEPIA FILTER";
  color: #fffd;
  bottom: 6.5vmin;
  background: linear-gradient(180deg, black 3.35vmin, #fff0 3.35vmin), conic-gradient(from -45deg at var(--pos) 100%, var(--black) 0 25%, #fff0 0 100%);
  padding: 1vmin 0.5vmin 2vmin;
  text-shadow: none;
  letter-spacing: 0.5px;
  margin-left: 0;
  opacity: 0.65;
  transition: var(--trsn);
  width: 100%;
  box-sizing: border-box;
  text-align: center;
}

label[for=invert]:after {
  content: "INVERT GRAIN";
}


/*** checked ***/

input:checked + label:before {
  left: 7.25vmin;
  transition: var(--trsn);
  background: #39b13e;
}

input#sepia:checked ~ .content {
  filter: sepia(0.75);
}

input#invert:checked ~ .content .film {
  filter: invert(1)
}

input:checked + label:after {
  animation: arrow 0.5s ease 0s 1;
  animation-fill-mode: forwards;
  transition: var(--trsn);
  filter: invert(1);
}

input:checked + label[for=sepia]:after {
  filter: invert(0.75) sepia(1);
}

@keyframes arrow {
  0% { --pos: 20%; }
  100% { --pos: 80%; }
}