@media (prefers-color-scheme: dark) {
body {
    background-attachment : fixed;
    background-image : url("background.jpg");
    background-position : center;
    background-repeat : no-repeat;
    background-size : cover;
}

ul li.sel, ul li.nor:hover {
    background-color : rgba(55, 55, 55, 0.8);
}

ul li.nor {
    background-color : rgba(25, 25, 25, 0.8);
}

div {
    background-color : rgba(55, 55, 55, 0.8);
}

.thing {
    border-color : #44c;
}
}