@charset "UTF-8";
*::before,
*,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  width: 100%;
  height: 100vh;
  justify-content: center;
  align-items: center;
  background: #333;
  perspective: 200px;
  box-shadow: inset 0 0 200px;
  animation: focusToSlider 500ms ease-out reverse;
}

.image-slider-container {
  position: relative;
  width: 800px;
  height: 500px;
  border: 5px solid #fff;
  border-radius: 20px;
  overflow: hidden;
  transform: scale(1) rotate(0);
  transition: transform 300ms ease;
  transform-style: preserve-3d;
}
.image-slider-container .image {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background-size: cover;
  background-position: center;
}
.image-slider-container .image:nth-child(1) {
  background: url("https://cdn.pixabay.com/photo/2014/04/17/23/26/environmental-protection-326923_1280.jpg");
  filter: grayscale(100%) blur(2.5px);
}
.image-slider-container .image:nth-child(2) {
  background: url("https://cdn.pixabay.com/photo/2014/04/17/23/26/environmental-protection-326923_1280.jpg");
  filter: saturate(1.3);
  width: 50%;
}
.image-slider-container .range-slider {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  margin: 0;
  background: rgba(242, 242, 242, 0.2);
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  z-index: 2;
  transition: all 200ms linear;
}
.image-slider-container .range-slider:hover {
  background: rgba(242, 242, 242, 0.1);
}
.image-slider-container .range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 6px;
  height: 800px;
  background: white;
  cursor: move;
  transition: all 300ms ease;
}

.slider-control {
  z-index: 0;
  position: relative;
  display: block;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: white;
  top: 50%;
  left: 50%;
  transform: translate(-60%, -50%);
  cursor: grab;
}
.slider-control::after, .slider-control::before {
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}
.slider-control::after {
  content: "";
  right: 3px;
}
.slider-control::before {
  content: "";
  left: 3px;
}

@keyframes focusToSlider {
  from {
    box-shadow: inset 0 0 200px;
  }
  to {
    box-shadow: inset 0 0 0 0;
  }
}