Best way to add CSS properties to Container (DIV)

I would like to add this to a Common Controls Container (DIV). What’s the best way in AppStudio?

div {
-webkit-user-select: none; /* Safari */
-ms-user-select: none; /* IE 10+ and Edge */
user-select: none; /* Standard syntax */
}

This removes the ability of the user to select any text in this div.

Put it in the style property, like this:

-webkit-user-select: none; -ms-user-select: none; user-select: none;

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