If you use the nodered theme only groups will be seperated by borders. Widgets within in one group will be shown within the same box. You have three options to get that separation between widgets:
1-Either as said above you put each widget into its own group.
2-you use the option angular theme everywhere as this includes separation between widgets.
3-you are comfortable with css. Than have a look at this:
Those are your three best options as far as i know
best regards johannes
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