Javascript Can'；t在底图前面显示模式窗口

我试图在我的地图前面显示一个模式窗口，但它不起作用（我猜它发生在基本地图后面）。如果我移除贴图容器和tilelayer，它会工作得很好。我不知所措。这是一个简单的订购问题还是更复杂的问题（我过去曾遇到过与传单的兼容性问题）

HTML

JAVASCRIPT

// Get the modal
    var modal = document.getElementById("myModal");
    
    // Get the button that opens the modal
    var btn = document.getElementById("myBtn");
    
    // Get the <span> element that closes the modal
    var span = document.getElementsByClassName("close")[0];
    
    // When the user clicks the button, open the modal 
    btn.onclick = function() {
      modal.style.display = "block";
    };
    
    // When the user clicks on <span> (x), close the modal
    span.onclick = function() {
      modal.style.display = "none";
    };
    
    // When the user clicks anywhere outside of the modal, close it
    window.onclick = function(event) {
      if (event.target == modal) {
        modal.style.display = "none";
      }
    };
         
    var maCarte = L.map('carte', { zoomControl: false });
        new L.Control.Zoom ({ position: 'bottomleft' }).addTo(maCarte);
    maCarte.setView([45.5288,-73.631884], 15);
        
    var fondDeCarte = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
        {attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'}
    );
    maCarte.addLayer(fondDeCarte);

//获取模式
var modal=document.getElementById（“myModal”）；
//获取打开模式对话框的按钮
var btn=document.getElementById（“myBtn”）；
//获取关闭模态的元素
var span=document.getElementsByClassName（“关闭”）[0]；
//当用户单击该按钮时，打开模式对话框
btn.onclick=函数（）{
modal.style.display=“块”；
};
//当用户单击（x）时，关闭模式对话框
span.onclick=函数（）{
modal.style.display=“无”；
};
//当用户单击模式之外的任何位置时，将其关闭
window.onclick=函数（事件）{
如果（event.target==模态）{
modal.style.display=“无”；
}
};
var maCarte=L.map（'carte'，{zoomControl:false}）；
新的L.Control.Zoom（{position:'bottomleft'}）；
maCarte.setView（[45.5288，-73.631884]，15）；
var fondDeCarte=L.tileLayer（'http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png'，
{属性：'©；贡献者'}
);
maCarte.addLayer（fondDeCarte）；

    html,body{
        height:100%;
        margin:0
    }
            
    #carte {
        width: 100%;
        height: 100%
    }   

    .title{
        color: white;
        font-family:Impact, Charcoal, sans-serif;
    }
    
    .modal {
        display: none; /* Hidden by default */
        position: fixed; /* Stay in place */
        z-index: 1; /* Sit on top */
        padding-top: 100px; /* Location of the box */
        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 */
    }
      
    /* Modal Content */
    .modal-content {
        background-color: #fefefe;
        margin: auto;
        padding: 20px;
        border: 1px solid #888;
        width: 80%;
    }
      
    /* The Close Button */
    .close {
        color: #aaaaaa;
        float: right;
        font-size: 28px;
        font-weight: bold;
    }
      
    .close:hover,
    .close:focus {
        color: #000;
        text-decoration: none;
        cursor: pointer;
    }

// Get the modal
    var modal = document.getElementById("myModal");
    
    // Get the button that opens the modal
    var btn = document.getElementById("myBtn");
    
    // Get the <span> element that closes the modal
    var span = document.getElementsByClassName("close")[0];
    
    // When the user clicks the button, open the modal 
    btn.onclick = function() {
      modal.style.display = "block";
    };
    
    // When the user clicks on <span> (x), close the modal
    span.onclick = function() {
      modal.style.display = "none";
    };
    
    // When the user clicks anywhere outside of the modal, close it
    window.onclick = function(event) {
      if (event.target == modal) {
        modal.style.display = "none";
      }
    };
         
    var maCarte = L.map('carte', { zoomControl: false });
        new L.Control.Zoom ({ position: 'bottomleft' }).addTo(maCarte);
    maCarte.setView([45.5288,-73.631884], 15);
        
    var fondDeCarte = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png',
        {attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'}
    );
    maCarte.addLayer(fondDeCarte);