.pr-ad { width: 100%; box-sizing: border-box; text-align: center; margin: 24px auto; padding: 12px 0; clear: both; }
.pr-ad[hidden] { display: none; }
.pr-ad-label { display: block; margin-bottom: 6px; font: 11px/1.4 Arial, sans-serif; color: #687482; letter-spacing: .5px; }
.pr-ad-slot { width: 300px; min-height: 250px; margin: 0 auto; }