.wp-block-latest-posts.wp-block-latest-posts__list li {
counter-increment: my-awesome-counter;
position: relative;
}
.wp-block-latest-posts.wp-block-latest-posts__list li:before {
display: inline-block;
content: counter(my-awesome-counter);
background-color: #008c72;
border-radius: 50%;
line-height: 30px;
color: #fff;
text-align: center;
margin-right: 0.5rem;
min-width: 30px;
min-height: 30px;
position: absolute;
left: -15px;
transform: translateX(-100%);
}
<!DOCTYPE html>
<html>
<head>
<style>
body {
/* Set "my-sec-counter" to 0 */
counter-reset: my-sec-counter;
}
h2::before {
/* Increment "my-sec-counter" by 1 */
counter-increment: my-sec-counter;
content: "Section " counter(my-sec-counter) ". ";
}
</style>
</head>
<body>
<h2>HTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h2>JavaScript Tutorial</h2>
<h2>Bootstrap Tutorial</h2>
<h2>SQL Tutorial</h2>
<h2>PHP Tutorial</h2>
</body>
</html>
