/* some style */

body,
.app {
    padding: 0;
    margin: 0;
}

.desktop {
    background-color: gray;
}

.executive {
    background-color: black;
    color: green;
}

.titlebar {
    background-color: cornflowerblue;
}

.window {
    background-color: whitesmoke;
    color: darkslategrey;
}