Hi,
The sizes of the cards are defined by the available width of a card. So the height is a ratio of the width. I would not recommend to stretch the cards and change the ratio of it. That can have some nasty effects.
Although you can change the overall alignment with CSS. There is a great guide online to use A Complete Guide to Grid | CSS-Tricks - CSS-Tricks.
Edit: most cards have a fixed height defined by margins and icon sizes others use the ratio I have described.