What does the red 'it' refer to?

[Xianyu]

Chen Wei-yih has posed for a set of photos in a flowing white dress, and enlisted a wedding planner and rented a banquet hall for a marriage celebration with 30 friends. But there is no groom. Chen will marry herself. Uninspired by the men she's met but facing social pressure to get married, the 30-year-old Taipei office worker will hold the reception next month in honor of just one person. "Age thirty is a prime period for me. My work and experience are in good shape, but I haven't found a partner, so what can I do?" Chen said.
"It's not that I'm anti-marriage. I just hope that I can express a different idea within the bounds of a tradition."

Hi, everybody!
Could you please tell me what the red 'it' refers to? Thanks!

[Beeesneees]

(The whole concept/idea/feeling) is not that I'm anti-marriage
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Cheers m' dears!

[Xianyu]

Thank you so much, Beeesneees. I've got it.

Have a nice day! :)