Fix header logo size

@jaydeep_patel The problem is that the logo's default size is too large. Since CSS is coming from the CDN, we can't adjust the image size, so the option is to change the logo's default size. After changing the logo's size, it looks good.
The other option is to add the width:50% for the class .pico img so that if someone could upload the logo with a different size then it can't affect the logo size.