.erp-button {
    background-color: #0073aa;
    color: #fff;
    padding: 10px 20px;
    border: none;
    cursor: pointer;
    font-size: 16px;
}

.erp-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
}

.erp-modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.erp-close {
    color: #aaa;
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}