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We will consider updating the built-in style sheets so that they are prefixed. By default when you use one of the built in templates or a custom one where you do not specify a custom theme there will be built in styles loaded. Please try creating a custom theme and registering it so that your pages use your theme. You can follow the instructions from this guide: Creating a theme
. If you use a custom theme only one CSS file with built in styles will be loaded and this will be the one which defines column layouts.
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