Make Slider larger

Hi, My site is drlapco.com and i would like for the slider to be larger, meaning to have a bigger width, and therefore make the image larger. whats the css code(if there is) or anywhere in the files? if its possible, also the code for the menu to also extend it to align with the sliders. If you dont understant what i mean, where the images are, i want to make that entire box of images occupy more space, like change the width. Thank you