How to change the range slider marker?

Question

I have to achieve this: Range Slider

I have done the range slider part but I am facing issues while changing the marker over range slider. Even I am providing the image src : "https://png.icons8.com/metro/52/000000/sort-down.png".

I am adding my work upto where I have completed.

var slider = document.getElementById("myRange");
var output = document.getElementById("demo");

.slidecontainer {
  width: 100%;
}

.slider {
  width: 30%;
  height: 10px;
  border-radius: 5px;
  background-image: linear-gradient(to right, rgba(255, 0, 0, 1), rgba(0, 128, 0, 1));
  outline: none;
  opacity: 0.7;
  transition: opacity .2s;
  -webkit-appearance: none;
}

.slider:hover {
   background-image: linear-gradient(to right, rgba(255, 0, 0, 1), rgba(0, 128, 0, 1));
}

.slider::-webkit-slider-thumb {
  width: 23px;
  height: 24px;
  border: 0;
  background: url('contrasticon.png');
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 23px;
  height: 24px;
  border: 0;
  background: url('contrasticon.png');
  cursor: pointer;
}

<div class="slidecontainer">
  <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
  
</div>

Answer 1

You need to use appearance: none; on the slider thumb to use a custom image. Have a look:

.slidecontainer {
  width: 100%;
}

.slider {
  width: 30%;
  height: 10px;
  border-radius: 5px;
  background-image: linear-gradient(to right, rgba(255, 0, 0, 1), rgba(0, 128, 0, 1));
  outline: none;
  opacity: 0.7;
  transition: opacity .2s;
  -webkit-appearance: none;
}

.slider:hover {
   background-image: linear-gradient(to right, rgba(255, 0, 0, 1), rgba(0, 128, 0, 1));
}

.slider::-webkit-slider-thumb {
  width: 23px;
  height: 24px;
  border: 0;
  background: url('https://png.icons8.com/metro/52/000000/sort-down.png');
  background-size: 16px;
  background-repeat: no-repeat;
  background-position: 0 -4px;
  cursor: pointer;
  -webkit-appearance: none;
}

.slider::-moz-range-thumb {
  width: 23px;
  height: 24px;
  border: 0;
  background: url('https://png.icons8.com/metro/52/000000/sort-down.png');
    background-size: 16px;
  background-repeat: no-repeat;
  background-position: 0 -4px;

  cursor: pointer;
  -moz-appearance: none;
}

<div class="slidecontainer">
  <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
  
</div>

Now feel free to change the image property like size, rotation, z-index whatever you need