Wordpress default CSS styles must include
.alignleft {
display: inline;
float: left;
margin-right: 1.5em;
}
.alignright {
display: inline;
float: right;
margin-left: 1.5em;
}
.aligncenter {
clear: both;
display: block;
margin: 0 auto;
}
.sticky {
}
.hentry {
margin: 0 0 1.5em;
}
.bypostauthor {
}
.wp-caption {
border: 1px solid #ccc;
margin-bottom: 1.5em;
max-width: 100%;
}
.wp-caption img[class*="wp-image-"] {
display: block;
margin: 1.2% auto 0;
max-width: 98%;
}
.wp-caption-text {
text-align: center;
}
.wp-caption .wp-caption-text {
margin: 0.8075em 0;
}
.gallery-caption {
}
.bypostauthor {
}