Can’t get images to align with Gutenberg editor

CSS

In Customize -> Additional CSS, add the following code:

.clearflow {
    clear: both;
}
figure.alignleft {
    margin-right: 1rem;
}

Blocks

Insert blocks in the following order:

    Image
    Paragraph
    ...
    Paragraph
    Image
    Paragraph
    ...
    Paragraph

Select Image block, and on its toolbar, select Align left icon. In Advanced -> Additional CSS Class section, add clearflow class.

Repeat this for every Image block.