:root {
    --index_bg: url("../images/dark_0.jpg");
    --login_bg: url("../images/dark_1.jpg");
    --home_bg: url("../images/dark_2.jpg");
}

* {
    margin: 0;
    padding: 0;
}

body {
    background: black;
}

a {
    color: inherit; /* 继承父元素颜色 */
    text-decoration: none; /* 去除下划线 */
    outline: none; /* 去除焦点轮廓 */
}

.no_select {
    cursor: default;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}