Twenty Nineteen: Separator block alignment issue

[umesh84]

Twenty Nineteen Themes Separator Block select Default style not center aligned in editor and Front side

Steps to replicate:
1: Activate the Twenty Nineteen Theme
2: add Separator block
3: Select Default style

I have given the video link of the issue below.
​https://www.loom.com/share/7f80bd907043491fbe8c28d30dd4cc1a

[kajalgohel]

patch added

[sabernhardt]

I think aligning the separator line to the side by default is appropriate in Twenty Nineteen because headings have a similar line on the side.

However, if you purposely set it to align center, that does not work at 768 pixels and wider:

@media only screen and (min-width: 768px) {
  .entry .entry-content > *.aligncenter,
  .entry .entry-summary > *.aligncenter,
  .entry .entry-summary > .wp-block-group > .wp-block-group__inner-container > *.aligncenter,
  .entry .entry-content > .wp-block-group > .wp-block-group__inner-container > *.aligncenter {
    margin-left: 0;
    margin-right: 0;
  }
}

The ​side margins were set to zero before the theme was widely available.