seahub/frontend/src/css/share-to-user.css

.user-details-popover {
  border: 1px solid #eee;
  border-radius: 4px;
  box-shadow: 0 0 14px rgba(0, 0, 0, 0.14);
  background: #fff;
  z-index: 1000;
  left: 2px;
  top: 24px;
}

.user-details-main {
  border-bottom: 1px solid #eee;
}

.user-details-name {
  font-size: 1rem;
  font-weight: 500;
}