img {
  width: 100%;
  height: auto;
}

.wrap {
  position: relative;
  display: flex;
}

.wrap::before {
  content: '↔';
  position: absolute;
  top: 50%;
  left: var(--slider-thumb-position);
  height: 30px;
  width: 30px;
  background-color: #fff;
  margin: -15px 0 0 -15px;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  z-index: 1;
  pointer-events: none;
}

.img-after {
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 100%;
  clip-path: inset(0 calc(100% - var(--slider-thumb-position)) 0 0);
  background-image: url('https://advancedpowerwashing.co.uk/assets/img/20231016_154546-334_x_250.jpg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1');
  background-size: cover;
  /*filter: grayscale(100%);*/
}

input[type='range'] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  appearance: none;
  background-color: transparent;
  cursor: ew-resize;
}

input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 0;
  height: 0;
}

input[type="range"]::-moz-range-thumb {
  appearance: none;
  width: 0;
  height: 0;
}