demo-container { display: block; border: 2px solid rgb(189, 189, 189); padding: 25px 10px 10px; border-radius: 4px; width: fit-content;

}
demo-object { display: block; background-color: rgb(224, 255, 253);counter-set: my-counter 0;}
.element {content: my-counter;}
block-block { display: block; }
block-block::before { counter-increment: my-counter 1; content: counter(my-counter); }