Interaction between Frameworks
There are cases where is it useful to use more than one CSS Framework. As an example the Timed Modal example uses the Bootstrap Framework.
Overriding Template Defaults
This is similar to the problem with the interaction between Frameworks. In this case the default value of a template colour had to be overridden when the colour was determined to be "too pink". The w3-sand colour is overridden to a custom pale-grey