.empty-examples div:empty {
    background-color: #fff3cd;
    border: 2px solid #ffc107;
    padding: 10px;
    margin: 5px 0;
    min-height: 20px;
}
.empty-examples div:empty::before {
    content: "✓ This div is empty";
    color: #856404;
}
.empty-examples div:not(:empty) {
    background-color: #d1ecf1;
    border: 2px solid #17a2b8;
    padding: 10px;
    margin: 5px 0;
}