OperatingSystemView.css

.logo {
    color: white;
    background-image: linear-gradient(
        to bottom,
        alpha(@accent_color_500, 0.25),
        alpha(@accent_color_700, 0.75)
    );
    border-radius: 100%;
    box-shadow:
        inset 0 -1px 0 0 alpha(@highlight_color, 0.2),
        inset 0 1px 0 0 alpha(@highlight_color, 0.3),
        inset 1px 0 0 0 alpha(@highlight_color, 0.07),
        inset -1px 0 0 0 alpha(@highlight_color, 0.07);
    -gtk-icon-shadow:
        0 1px 1px alpha(black, 0.3),
        0 2px 3px alpha(@accent_color_900, 0.2);
    -gtk-icon-style: symbolic;
}

picture {
    background: #333;
    box-shadow:
        0 0 0 1px alpha(black, 0.7),
        0 1px 3px alpha(black, 0.12),
        0 1px 2px alpha(black, 0.24);
    border-radius: 100%;
    min-height: 128px;
    min-width: 128px;
}