Vector illustration derived from an existing PNG with rounded corners of opening and closing quotation marks, rendered as a crisp SVG on a 200x200 pixel canvas. Preserve the original composition with the main subject centered, built from clean geometric shapes and bold outlines. Use flat color blocks with subtle gradients to convey depth while avoiding raster textures. Employ scalable vector paths and minimal detail to maintain recognizability at small sizes. Retain the original color palette and contrast; set a transparent background for versatility. The final SVG should be polished, modern and suitable for icons or UI artwork.

The image shows a black and white speech bubble icon on a white background. The speech bubble is composed of two speech bubbles, one with a curved line and the other with a straight line. The text inside the speech bubbles is written in a bold font.