Input range slider HTML style05

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Custom Range Slider | par NGLESSON</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="keyword" content="Custom Range Slider">
    <meta name="author" content="Mezgani said">
    <meta name="copyright" content="NGLESSON">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" rel="stylesheet" type="text/css">
    <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
    <link href="style.css"  rel="stylesheet" type="text/css">
</head>
<body class="container">
    <div class="row mt-5">
        <div class="col-lg-6">
          <h1>Round Range Slider</h1>
          <div class="slidecontainer">
            <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
            <p>Value: <span id="demo"></span></p>
          </div>        
        </div>
   	</div>
	<script type="text/javascript" src="script.js"></script>
</body>
</html>

@charset "utf-8";
@import url('https://fonts.googleapis.com/css2?family=Ubuntu:wght@300&display=swap');

* {
    margin:0px;
    padding:0px;
    box-sizing: border-box;
    font-family: 'Ubuntu', sans-serif;
} 

.slidecontainer {
  width: 100%;
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 5px;
  background: #d3d3d3;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

.slider:hover {
  opacity: 1;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #4CAF50;
  cursor: pointer;
}

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

slider.oninput = function() {
  output.innerHTML = this.value;
}