Opacity

Install this Custom CSS Manager plugin http://ww.wp.xz.cn/plugins/custom-css-manager-plugin

Then use its “CSS Code” section of the dashboard to hold your CSS modifications:

.site-header,
.entry-meta-wrapper,
.comment-meta,
.page-links span.active-link,
.page-links a span.active-link {
 opacity: .9;
 /* (goes up to 1)*/
}