Images with captions are not centered.

sorry, the web page is:
https://www.acecars.net/?p=18

Try adding:

.aligncenter {
	display: block;
	margin-left: auto;
	margin-right: auto;
}
.alignleft {
	float: left;
}
.alignright {
	float: right;
}

to your theme’s stylesheet.

Thx for the suggestion, but all images with captions are shown left justified (even if I specify none, center, or right).

First, I’d run your HTML and CSS through the validator, since I’m noticing a lot of errors (for example, class=”margin-left: 20px;” isn’t the proper way to specify a style–should be style=”margin-left: 20px;”)

https://validator.w3.org/

Second, add the code esme posted to your theme’s stylesheet, because there’s no defaults set for those classes. When you align an image to the center, it adds the class=”aligncenter” attribute to the image, which then references the stylesheet and looks for that class’ properties.

The un-captioned images are centered in this case because the paragraph tags around them have the text-align: center property applied, but it’s better to do it the way esme suggested.

Thank you!