I've developed a custom module which basically creates a button for a row I have on a database ; something like : 

[Button]

[Button]

[Button]

- my problem is when I place this custom module on a left pane and a content pane of my page, It seems to overlap , the custom module on the content pane goes below the module on the left pane. 

Do I have to indicate some width on the custom module to prevent this overlapping.. ??