about the height with two posts

Hi there,

that space is Separating Space in Customizer > Layout > Container.
However that will also affect the spacing for the entire site, eg. the space between the sidebar widgets.

If you just want to reduce the spacing between the archive posts then add this CSS:

:is(.archive, .blog) .post {
    margin-bottom: 0;
}

hello David：

yes.

first i changed it in Customizer > Layout > Container.but the sidebar's height also chaged.

ok now .

thanks.

Glad to be of help!