Code:

<h2>注册表单</h2>

<button onclick="document.getElementById('id01').style.display='block'" style="width:auto;">注册</button>

<div id="id01" class="modal">
    <span onclick="document.getElementById('id01').style.display='none'" class="close" title="Close Modal">nt</span>
    <form class="modal-content animate" action="/action_page.php">
        <div class="container">
            <label><b>Email</b></label>
            <input type="text" placeholder="Enter Email" name="email" required>

            <label><b>Password</b></label>
            <input type="password" placeholder="Enter Password" name="psw" required>

            <label><b>Repeat Password</b></label>
            <input type="password" placeholder="Repeat Password" name="psw-repeat" required>
            <input type="checkbox" checked="checked"> Remember me
            <p>By creating an account you agree to our <a href="#">Terms & Privacy</a>.</p>

            <div class="clearfix">
                <button type="button" onclick="document.getElementById('id01').style.display='none'" class="cancelbtn">Cancel</button>
                <button type="submit" class="signupbtn">Sign Up</button>
            </div>
        </div>
    </form>
</div>
<style>
    /* Full-width input fields */
    input[type=text], input[type=password] {
        width: 100%;
        padding: 12px 20px;
        margin: 8px 0;
        display: inline-block;
        border: 1px solid #ccc;
        box-sizing: border-box;
    }

    /* Set a style for all buttons */
    button {
        background-color: #4CAF50;
        color: white;
        padding: 14px 20px;
        margin: 8px 0;
        border: none;
        cursor: pointer;
        width: 100%;
    }

    /* Extra styles for the cancel button */
    .cancelbtn {
        padding: 14px 20px;
        background-color: #f44336;
    }

    /* Float cancel and signup buttons and add an equal width */
    .cancelbtn, .signupbtn {
        float: left;
        width: 50%
    }

    /* Add padding to container elements */
    .container {
        padding: 16px;
    }

    /* 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 */
    }

    /* The Close Button (x) */
    .close {
        position: absolute;
        right: 35px;
        top: 15px;
        color: #000;
        font-size: 40px;
        font-weight: bold;
    }

        .close:hover,
        .close:focus {
            color: red;
            cursor: pointer;
        }

    /* Clear floats */
    .clearfix::after {
        content: "";
        clear: both;
        display: table;
    }

    /* Change styles for cancel button and signup button on extra small screens */
    @media screen and (max-width: 300px) {
        .cancelbtn, .signupbtn {
            width: 100%;
        }
    }
</style>

<script>
    var modal = document.getElementById('id01');
 
    window.onclick = function (event) {
        if (event.target == modal) {
            modal.style.display = "none";
        }
    }
</script>

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