csslayout/placeholders/Circle.tsx

import * as React from 'react';

interface CircleProps {
    backgroundColor?: string;
    size?: number;
}

const Circle: React.FC<CircleProps> = ({ backgroundColor = 'rgba(0, 0, 0, .3)', size = 16 }) => {
    return (
        <div
            style={{
                backgroundColor,
                borderRadius: '9999px',
                height: `${size}px`,
                width: `${size}px`,
            }}
        />
    );
};

export default Circle;