How to Increase the width of the dot in Line chart by CSS

I want to increase the size of the symbol in Line chart via CSS I have applied the CSS as shown in the below pic through stroke-width property but due to this the width of the symbol (circle) increases only when you select it or hover on it. Is there any way to change the size of the circle. I have searched a lot regarding this but everywhere stroke-width property was used to set the size
Is there any other property through which the size of the symbol can be increased. I have also tried height, width etc properties