Modify SVG size for inline Sparklines in a Matrix visual

I am trying to create inline sparkline charts using embedded SVGs for a matrix in Power BI. Below is the code for formatting the image. However, the image is occupying the top left side of the cell instead of occupying the entire cell. I need to fix the image to occupy the entire cell instead.

VAR SVGImageURL = "data:image/svg+xml;utf8," &

"<svg xmlns='http://www.w3.org/2000/svg' x='0px' y='0px' viewBox='0 0 100 100'>" &

"<polyline fill='none' stroke='" & LineColor & "' stroke-width='1' points='"& Lines &

"'/></svg>"

 I tried to change the "image height" in the "format" section in Visualizations pane but that doesnt change the width. I also tried to add width parameter to the Html but it doesnt seem to reflect in the image. Below is the image of my visual.