css: overflow scroll adds extra padding-CodePudding

I have the following html & css code:

<!DOCTYPE html>
<html>
  <head>
    <style type="text/css">
      html, body {
        margin: 0;
      }
      #container{
        width:100vw;
        height:100vh;
        background-color: green;
      }
      #left-bar{
        position: absolute;
        width: 300px;
        height: 100vh;
        background-color: red;
        overflow: scroll;
      }
    </style>
  </head>
  <body>
    <div id="container">
      <div id="left-bar" >
      </div>
    </div>
  </body>
</html>

It gives:

There is a padding inside the left bar, i do not understand why and how i can remove it.

Things I tried:

add padding: 0; on left bar, it does not work (with !important as well).
Use inspector to understand where the padding comes from. I did not find.
remove overflow: scroll on left-bar. It works but I want the left-bar to have the behavior overflow: scroll

How can I remove this padding inside the left-bar ?

EDIT: The bug disappeared with the exact same code.

Now with the same code i have:

What i did:

restart my computer, the bug is still here
add css code to style the scroll bar
remove the code i added --> the bug disappeared

I do not understand why...

CodePudding user response：

What you are seeing is an empty scrollbar. Set the overflow overflow: auto. This will only show the scrollbar if the content is overflowing.

<!DOCTYPE html>
<html>
  <head>
    <style type="text/css">
      html, body {
        margin: 0;
      }
      #container{
        width:100vw;
        height:100vh;
        background-color: green;
      }
      #left-bar{
        position: absolute;
        width: 300px;
        height: 100vh;
        background-color: red;
        overflow: auto;
      }
    </style>
  </head>
  <body>
    <div id="container">
      <div id="left-bar" >
      </div>
    </div>
  </body>
</html>

CodePudding user response：

You might consider using a plugin that does a minimal scrollbar (maybe simplerbar). Also consider doing only overflow-y:scroll for more acceptable appearance. You could also change colors of the scroll gutter colors

var el1 = document.querySelector('[data-id=div1]');
var el2 = document.querySelector('[data-id=div2]');

instance1 = new SimpleBar(el1);
instance2 = new SimpleBar(el2);

<script src="https://cdnjs.cloudflare.com/ajax/libs/simplebar/5.3.8/simplebar.min.js" integrity="sha512-2SAzoBQi2FbvWkvcsoYW4PH478pUu0gwa7BRA6YQxg6kCWUIOIDfFHMLH57GbWeLa pkYitOD5j9mIhIt3CLKA==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/simplebar/5.3.8/simplebar.min.css" integrity="sha512-uZTwaYYhJLFXaXYm1jdNiH6JZ1wLCTVnarJza7iZ1OKQmvi6prtk85NMvicoSobylP5K4FCdGEc4vk1AYT8b9Q==" crossorigin="anonymous" referrerpolicy="no-referrer"
/>

<div dir="ltr">

  <div data-id="div1" style="height: 300px; width: 200px; padding:10px; display: inline-block; border:1px solid gray; background: lightblue; ">
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  </div>

  <section data-id="div2" style="height: 300px; width: 200px; padding:10px; display: inline-block; border:1px solid gray">
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  </section>


</div>