Bootstrap 5 provides the List Group Flush feature in which items are stored in the form of a list. List groups are a flexible and powerful component for displaying a series of content. The List Group Flush feature is used to remove borders and rounded corners around the items on the list.
List group Flush Class:
- list-group-flush: This class is used to remove the borders and rounded corners around the items.
Syntax:
<ul class="list-group list-group-flush">
<li class="list-group-item">...</li>
<li class="list-group-item">...</li>
</ul>
Example 1: The following code demonstrates the List Group Flush using the List Group Flush properties.
<!DOCTYPE html>
<html>
<head>
<link href=
"https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity=
"sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
crossorigin="anonymous">
</head>
<body>
<h1 class="text-success">
GeeksforGeeks
</h1>
<h2>Bootstrap 5 List Group Flush</h2>
<ul class="list-group list-group-flush">
<li class="list-group-item">Hello</li>
<li class="list-group-item">Geek</li>
<li class="list-group-item">GeeksforGeeks</li>
</ul>
</body>
</html>
Output:

Example 2: The following code demonstrates the nested List Group Flush using the List Group Flush properties.
<!DOCTYPE html>
<html>
<head>
<link href=
"https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
rel="stylesheet"
integrity=
"sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
crossorigin="anonymous">
</head>
<body>
<h1 class="text-success">
GeeksforGeeks
</h1>
<h2>Bootstrap 5 Nested List Group using Flush</h2>
<ul class="list-group">
<li class="list-group-item">
<ul class="list-group list-group-flush">
<li class="list-group-item">C++</li>
<li class="list-group-item">C</li>
<li class="list-group-item">JavaScript</li>
</ul>
</li>
<li class="list-group-item">Geek</li>
<li class="list-group-item">GeeksforGeeks</li>
</ul>
</body>
</html>
Output:

Reference: https://getbootstrap.com/docs/5.0/components/list-group/#flush