How to display the slider with images in a better manner

Hi,

I am using the wordpress default gallery and when the horizontal images are uploaded they are not getting displayed properly.

Images are shown only half.

Request you to kindly suggest on how to get the same solved.

For example, please click on the below link and click on the gallery.

http://www.unicornridersclub.com/longrides/visit-to-gulbargabidar/