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<h1> Range Slider</h1>
<p>Please use your mouse to drag the slider below.</p>

<div class="slidecontainer">
   <input type="range" min="1" max="100" value="50" class="slider" id="myRange">
   <p>The Value of Ranger Slider: <span id="demo"></span></p>


                /*Thiết lập style cho ranger slider*/
.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 15px;
  border-radius: 5px;  
  background: #d3d3d3;
  outline: none;
  opacity: 0.7;
  -webkit-transition: .2s;
  transition: opacity .2s;

/*Thiết kế phần để kéo trượt trong rangerslider -- dùng -webkit- để chạy trên Chrome, Opera, Safari, Edge*/
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 25px;
  height: 25px;
  border-radius: 50%; 
  background: DodgerBlue;
  cursor: pointer;

/*-moz- dùng để thiết kế rangerslider trên firefox nhé*/
.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");
/* Hiển thị giá trị mặc định 50 cho thẻ span với id là demo*/
output.innerHTML = slider.value; 

/* cập nhật giá trị hiện tại của ranger slider*/
slider.oninput = function() {
  output.innerHTML = this.value;