Screen {
    align: center middle;
}

#main_container {
    align: center middle;
    width: 80%;
    height: auto;
    border: thick $primary-lighten-2;
    padding: 2;
}

#sentence {
    content-align: center middle;
    width: 100%;
    height: 5;
    margin-bottom: 2;
}

#progress {
    width: 100%;
    content-align: center middle;
    margin-bottom: 1;
    color: $text-muted;
}

#button_container {
    align-horizontal: center;
    width: 100%;
    height: auto;
}

Button {
    width: 50%;
    margin: 0 1;
}