Editing Template:Block right/styles.css

/*
 * Styles for the block right template
 */
 
.wst-block-right {
	float:right;
	max-width:100%;
	text-align:inherit;
	margin-left:0;
	margin-right:0;
}

/* When collapsing paragraphs, remove the site-default inter-para spacing */
.wst-block-right-collapse p {
	margin-top:0;
	margin-bottom:0;
}

/* Undo the site-default 0.5em of the preceding paragraph, so
 * the block right content doesn't have a gap */
.wst-block-right-collapse {
	margin-top: -0.5em;
}