.sidebar-square-ad {
  display: flex;
  width: 100%;
  aspect-ratio: 1;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border: 1px dashed #CBD5E1;
  border-radius: 12px;
  background: #F8FAFC;
  color: #94A3B8;
  text-align: center;
}
.sidebar-square-ad img,
.sidebar-square-ad iframe {
  width: 100%;
  height: 100%;
  border: 0;
  object-fit: cover;
}
.sidebar-square-ad-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.sidebar-square-ad-label i { color: #CBD5E1; font-size: 1.4rem; }