lib/modules/Notifications/styles/css/notifications.css
.notification-popover {
width: 500px;
max-width: 500px;
}
.notification-popover .arrow {
top: 50px !important;
}
.notification-popover-loader {
height: 60px;
}
.notification-item img {
width: 50px;
height: 50px;
}
.notification-item-message {
font-style: italic;
}