installer.tcss

Screen, Horizontal, Vertical {
    align: center middle;
    padding: 0;
}

SelectionList, Select, Terminal {
    width: 100%;
    height: 45%;
}

Button {
    width: 40%;
    padding: 0;
    margin: 0;
}

Label {
    margin-left: 1;
}

#advinstall, #cancel, #install {
    width: 100%;
    margin-bottom: 1;
    margin-left: 8;
}