.wrapper {
    display: grid;
    width: 80%;
    margin: 0;
  > * {
    grid-area: 1 / 1;
  }
}

.wrapper {
  /* make sure our images are the same size */
  img {
	width: 100%;
    aspect-ratio: 16/9;
	object-fit: cover;
  }
  
  .before {
    mask: linear-gradient(to right, black 0, var(--pos, 50%), transparent 0);
  }
  
  .after {
    mask: linear-gradient(to right, transparent 0, var(--pos, 50%), black 0);
  }
}

input[type='range'] {
  width: 100%;
  z-index: 1;
  appearance: none;
  background: transparent;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;

  /* styling for webkit (safari) and / blink (chrome) */
  &::-webkit-slider-thumb {
    appearance: none;
	height: 40px;
	width: 40px;
	background: #f24646;
	cursor: pointer;
	
	background-repeat: no-repeat;
	background-position: center;
	background-size: 80%;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 640 640'%3E%3Cpath fill='currentColor' d='M603.4 331.3L614.7 320L603.4 308.7L491.4 196.7L480.1 185.4L457.5 208L468.8 219.3L553.5 304L86.8 304L171.5 219.3L182.8 208L160.2 185.4L148.9 196.7L36.9 308.7L25.6 320L36.9 331.3L148.9 443.3L160.2 454.6L182.8 432L171.5 420.7L86.8 336L553.5 336L468.8 420.7L457.5 432L480.1 454.6L491.4 443.3L603.4 331.3z'/%3E%3C/svg%3E");
  }
  
  /* all the same stuff for firefox */
  &::-moz-range-thumb {
    appearance: none;
	height: 40px;
	width: 40px;
	background: #f24646;
	cursor: pointer;
	
	background-repeat: no-repeat;
	background-position: center;
	background-size: 80%;
	background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 640 640'%3E%3Cpath fill='currentColor' d='M603.4 331.3L614.7 320L603.4 308.7L491.4 196.7L480.1 185.4L457.5 208L468.8 219.3L553.5 304L86.8 304L171.5 219.3L182.8 208L160.2 185.4L148.9 196.7L36.9 308.7L25.6 320L36.9 331.3L148.9 443.3L160.2 454.6L182.8 432L171.5 420.7L86.8 336L553.5 336L468.8 420.7L457.5 432L480.1 454.6L491.4 443.3L603.4 331.3z'/%3E%3C/svg%3E");
  }
}