Embed draw.io iframe in discourse

[whitewaterdeu (王白水)]

I want to embed draw.io in my post

But when I paste these code, there is only a small frame

How can I expand it?

This is my post 心肌梗死误诊胆囊炎一例及如何减少心梗漏诊率 - 🥼实践与临床 - 始徒