Why is my embedded Google Sheet coming up so small on my webpage?

I am trying to embed a Google Sheet to my webpage but it is showing up super tiny. Squarespace support says the sizing has to do with the code, which doesn't make sense to me since everything I've tried to embed is coming up small. If it were in my code, I'd imaging that each embedded item would have their own sizing and show up as the size that is in their code.  

I tried uploading something else, to see if it to would come up small as well .... and it does (see attached image)

I will attach the embedded code below, and hopefully the issue is in there, as Squarespace support suggests.

Hopefully someone here can help me get this Google Sheet to show up larger on my webpage.

<iframe src="https://docs.google.com/spreadsheets/d/e/2PACX-1vQWOXCoB7PBkAXM2W1Q1lIjIyw8jsLqxIawtqk8ilgJ84QKjSHtxm5n0mXaV_lPBE0RJLb8QFNJmRX2/pubhtml?gid=836326452&amp;single=true&amp;widget=true&amp;headers=false"></iframe> 

Thanks in advance 

Hi,

Can you share link to this page? We can check easier

Or you can also try adding this to Design > Custom CSS first

iframe[src*="google.com"] {
	width: 100% !important;
	height: 500px !important;
}