.popup {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0,0,0,0.5);
        z-index: 2;
    }
    .popup-content {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: white;
        padding: 20px;
        border-radius: 5px;
        box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
        text-align:center;
    }