Most containers are set up so that they do not have a fixed height.
Here is a quick way to force a module to a certain height:
- Open the module settings.
- In the Advanced Settings, enter < div style="fixedHeight"> in the Header
- In the Advanced Settings, enter < /div> in the Footer
- In the CSS, create a style for fixedHeight and use something like "height:500px;"
Not that your CSS style could also define min-height and/or max-height if you need those.
(In the above, I added some extra spaced so that the div tags will show in this message. Removed them in your site.)
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You can also create custom containers that can be styled this way. You can also look at the code of the containers that you are using to identify divs or other structures that you can style as you like.