/* *{
    background-color:rgb(109, 210, 210);
} */
body {
    position: relative;
    margin: 0;
    padding: 0;
    z-index: 0;
    font-family: Arial, sans-serif;
}

/* 设置背景图片和半透明遮罩层 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url("173.jpg");
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 1.0; /* 控制背景图透明度 */
    z-index: -1;
}