I am using zen cart v150 and I building a mobile template. I need to know how I can expand the logos width. I do not display the tagline, but the space in the header still exist.

What I have is a logo width of 300 px. The I phone width is 320 px. what I see on displayed on the screen is that my logo is displaying a width of about 150px wide.

The space for the tagline is still there, blocking the logo from expanding to its full width.

How can I resolve this.