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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              //REF: https://ianchen.thisistap.com/filter-control-panel/

 h2 Update CSS Variables with 
  span.h1 JS
  //step刻度單位 (default為1)
  label(for='spacing') Spacing
  input#spacing(type='range', name='spacing', min='10', max='200', value='10', data-sizing='px')
  .value 10px
  label(for='blur') Blur
  input#blur(type='range', name='blur', min='0', max='25', value='1.5', step="0.01", data-sizing='px')
  .value 1.5px
  label(for='brightness') Brightness
  input#brightness(type='range', name='brightness', min='0', max='1', step="0.01", value='1')
  .value 1
  label(for='contrast') Contrast
  input#contrast(type='range', name='contrast', min='0', max='200', value='100', data-sizing='%')
  .value 100%
  label(for='grayscale') Grayscale
  input#grayscale(type='range', name='grayscale', min='0', max='100', value='0', data-sizing='%')
  .value 0%
  label(for='opacity') Opacity
  input#opacity(type='range', name='opacity', min='0', max='100', value='100', data-sizing='%')
  .value 100%
  label(for='saturate') Saturate
  input#saturate(type='range', name='saturate', min='0', max='100', value='100', data-sizing='%')
  .value 100%
  label(for='sepia') Sepia
  input#sepia(type='range', name='sepia', min='0', max='100', value='0', data-sizing='%')
  .value 0%
  label(for='base') Base Color
  input#base(type='color', name='base', value='#ffc600')
  .value #ffc600


              :root {
  --base: #ffc600;
  --spacing: 10px;
  --blur: 0px;
  --brightness: 1;
  --contrast: 100%;
  --grayscale: 0%;
  --opacity: 100%;
  --saturate: 100%;
  --sepia: 0%

* {
  font-family: Lato;
  box-sizing: border-box;
  color: #fff;

html, body {
  margin: 0;
  padding: 0;
  font-size: 0;
  width: 100vw;
  height: 100vh;

.img {
  width: 100vw;
  height: 100vh;
/*   background-image: url(https://ianchen.thisistap.com/wp-content/uploads/08.jpg); */
  background-size: cover;
  position: relative;
  border: solid var(--spacing) var(--base);
/*   padding: var(--spacing); */
/*   background: var(--base); */
  filter: blur(var(--blur)) brightness(var(--brightness)) contrast(var(--contrast)) grayscale(var(--grayscale)) opacity(var(--opacity)) saturate(var(--saturate)) sepia(var(--sepia));

.text {
  position: absolute;
  top: 0;
  left: 30px;
  font-size: 20px;
  color: #24260f;

.h1 {
  color: var(--base);

label {
  width: 100px;
  display: inline-block;
  margin-top: 20px;

 display: inline;
              const inputs=document.querySelectorAll(".controls input");

function handleUpdate(){
 const suffix =this.dataset.sizing || ""; 
 const suffix2 =this.getAttribute("data-sizing") || "";
 //dataset is a object, contains all the data info 
 //call data-sizing or nothing
 //select css root and change the root css
 document.documentElement.style.setProperty(`--${this.name}`, this.value+suffix);
 values[i].textContent=inputs[i].value+(inputs[i].dataset.sizing|| "");

inputs.forEach(input => input.addEventListener("change", handleUpdate)) //when all the input value changed, execute handleUpdate function
inputs.forEach(input => input.addEventListener("mousemove", handleUpdate)) //continuously change the value

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