wp-login.php als popup ?

<div id="userlogin"><button onclick="document.getElementById('id01').style.display='block'" style="width:auto;">Login</button></div


<style>
/* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
    padding-top: 60px;
}


/* Modal Content/Box */
.modal-content {
    background-color: #fefefe;
    margin: 5% auto 15% auto; /* 5% from the top, 15% from the bottom and centered */
    border: 1px solid #888;
    width: 80%; /* Could be more or less, depending on screen size */
}


/* Add Zoom Animation */
.animate {
    -webkit-animation: animatezoom 0.6s;
    animation: animatezoom 0.6s
}


@-webkit-keyframes animatezoom {
    from {-webkit-transform: scale(0)} 
    to {-webkit-transform: scale(1)}
}
    
@keyframes animatezoom {
    from {transform: scale(0)} 
    to {transform: scale(1)}
}


/* Change styles for span and cancel button on extra small screens */
@media screen and (max-width: 300px) {


}
</style>


<div id="id01" class="modal">
<form class="modal-content animate">
<div id='login' style='padding:10px; background:#aaa;'>
  <div id="test"><?php include ("wp-login.php"); ?></div>
</div>
</form>
</div>


<script>
// Get the modal
var modal = document.getElementById('id01');


// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}
</script>