.billing-report .version-select {
    padding: 6px 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background-color: #fff;
    font-size: 14px;
    cursor: pointer;
    outline: none;
}

.billing-report .version-select:hover {
    border-color: #aaa;
}

.billing-report .version-select:focus {
    border-color: #28a0f9;
    box-shadow: 0 0 0 2px rgba(66, 185, 131, 0.15);
}