css给div加阴影

box-shadow: h-offset v-offset blur-radius spread-radius color inset;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Box Shadow Example</title>
    <style>
        .shadow-div {
            width: 200px;
            height: 200px;
            background-color: #f0f0f0;
            box-shadow: 10px 10px 5px rgba(0, 0, 0, 0.3);
        }
        .inset-shadow-div {
            width: 200px;
            height: 200px;
            background-color: #f0f0f0;
            box-shadow: inset 10px 10px 5px rgba(0, 0, 0, 0.3);
        }
    </style>
</head>
<body>
    <div class="shadow-div"></div>
    <div class="inset-shadow-div"></div>
</body>
</html>

.shadow-div {
    width: 200px;
    height: 200px;
    background-color: #f0f0f0;
    box-shadow: 10px 10px 5px rgba(0, 0, 0, 0.3);
    display: block; /* 确保元素是可见的 */
}

.shadow-div {
    width: 200px;
    height: 200px;
    background-color: #f0f0f0;
    box-shadow: 10px 10px 5px rgba(255, 0, 0, 0.5); /* 红色阴影 */
}