Courses listing video not big enough

Please view this page: http://www.markhallam.net/cadman/training-in-word-endnote/

Each course listing band is created like this:`[content_band style="color: #333;" bg_color="#F0F8FF" border="all" inner_container="true"]
[column type="one-fourth"][course_media course_id="1100"][/column][column type="three-fourths" last="true"class="coursebox"] [course_title course_id="1100"]Instructor: Hilary Cadman[course show="summary" course_id="1100"][course_cost course_id="1100"][course_join_button course_id="1100"][/column]
[/content_band]`
The videos are too small. This might be a question for my theme provider but can you suggest how to increase the video size? inner_container="false" completely removes all padding. Thanks in advance for your advice.