I saw this recently at a restaurant. “Outdoor” is defined as “done, situated, or used out of doors.” It should be one word. “Everyday” is an adjective (a word that modifies a noun) defined as “happening or used every day” as in “Her everyday chore is doing the dishes.” “Every day” is an adverb (a word that modifies or qualifies an adjective, verb, or other adverb or a word group, expressing a relation of place, time, circumstance, manner, cause, degree–in this case relation of time to offering outdoor dining and take out). In this instance, “everyday” should be two words. See a tip for figuring out when to use “every day” here.
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