Pictures don’t align in center

Hello, pictures in posts don’t align in center. Please, fix it in next update.

.detail-content.single_page p img.aligncenter {
float: none;
margin-bottom: 15px;
display: inline-block;
}

I added in child theme next code and it worked.

.detail-content.single_page p img.aligncenter {
display: block;
margin-left: auto;
margin-right: auto;
text-align: center;
}