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 .popup {
   position: fixed;
   height: fit-content;
   inset: 0;
   margin: auto;
   background-color: #fff;
   padding: 20px;
   width: fit-content;
}

完整代码如下：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">

    <style>

        .popup {
            position: fixed;
            height: fit-content;
            inset: 0;
            margin: auto;
            background-color: #fff;
            padding: 20px;
            width: fit-content;
        }
    </style>
</head>
<body>


    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <div class="popup">
        我是弹出层
    </div>
</body>
</html>

还有一种古老的方式是：

.popup {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translatex(-50%) 
  translatey(-50%);

  background-color: #fff;
  padding: 20px;
  width: fit-content;
  height: fit-content;
}

完整代码如下：

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">

    <style>

        .popup {
            position: fixed;
            left: 50%;
            top: 50%;
            transform: translatex(-50%) translatey(-50%);

            background-color: #fff;
            padding: 20px;
            width: fit-content;
            height: fit-content;
        }
    </style>
</head>
<body>


    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <p>
        Lorem, ipsum dolor sit amet consectetur adipisicing elit. Repellendus voluptate recusandae quasi ex commodi, facere itaque, exercitationem, totam minus soluta atque assumenda? Aspernatur, quod assumenda at praesentium totam enim nam!
    </p>
    <div class="popup">
        我是弹出层
    </div>
</body>
</html>

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