Masato

Thanks a lot Steve for the advice!

Thank you very much. I will do so.
Yes, actually those are the files for people to download.

I am sorry for being late to make this topic resolved. Thanks a lot for your very kind support, paulwpxp.

I apologise for being this late to respond. I am not sure if you can still see this post or not, but I am talking about per uploaded file.

Thank you for your reply.
Because I wanted to keep the original quality of the images as much as possible. But maybe I should consider that way to solve the problem. So even it is written that 50MB is the limit, do 16MB images tend to cause problems?

Thanks a lot for the further explanation. I was thinking about adding rem just because the default style.css of Twenty Twelve includes it.
Actually I need to study more to do things accurately.

Thank you again paulwpxp.

I’ll try that code, and see how it works.
So, do you think I don’t have to include ‘rem’ width in this case?

Thank you so much. I appreciate you kindly told me about paddings as well, I was confused about 648px.

What would it be if I want to make the width ‘720px’?
Would it be something like this?

@media screen and (min-width: 648px) {
	body.template-front-page .site-content,
	body.single-attachment .site-content,
	body.full-width .site-content {
		width:720px; margin:0 auto; float:none;
	}
}

This was solved as time went by (I just re-widened it to 720px from 600px)!

However, I wanted to keep the size of top banner (abirdwhale.com) and menu (Main, Facebook, YouTube Channel etc.). Is there any good way to keep (or widen) their size?

Very many thanks,

Sorry, this was misleading. In my situation, the code above did not solve my problem…!
I am still waiting for advice.

Here is the part I added to style.css of my child theme to change the width.

/* This Block Adjusts the Overall Theme Width */
footer[role="contentinfo"] {
	max-width: 640px;
}
@media screen and (min-width: 600px) {
	.site {
		max-width: 640px;
		max-width: 45.7142857143rem;
	}
}
.ie .site {
	max-width: 640px;
}

Many thanks for your help,

Thanks!