/* Button */
.btn{
    background:#007bff;
    color:#fff;
    padding:12px 25px;
    text-decoration:none;
    border-radius:5px;
}

/* Popup Background */
.popup{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,.5);
    display:flex;
    justify-content:center;
    align-items:center;

    opacity:0;
    visibility:hidden;
    transition:.3s;
}

/* Show Popup */
.popup:target{
    opacity:1;
    visibility:visible;
}

/* Popup Box */
.popup-content{
    width:350px;
    background:#fff;
    border-radius:8px;
    padding:25px;
    text-align:center;
    position:relative;
    box-shadow:0 10px 30px rgba(0,0,0,.3);
}

/* Close Button */
.close{
    position:absolute;
    top:10px;
    right:15px;
    text-decoration:none;
    font-size:28px;
    color:#666;
}

.close:hover{
    color:red;
}

/* OK Button */
.ok-btn{
    display:inline-block;
    margin-top:20px;
    background:#28a745;
    color:#fff;
    padding:10px 20px;
    text-decoration:none;
    border-radius:5px;
}

.ok-btn:hover{
    background:#218838;
}