Screen {
    align: center bottom;
    
}

#main_container {
    align: center middle;
    width: 95%;
    height: auto;
    border: thick $primary-lighten-2;
    padding: 2;
}

#vice_container {
    align: center middle;
    width: 95%;
    height: auto;
    padding: 2;
}

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

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



Button {
    align-horizontal: center;
    width: 50%;
    margin: 0 0;
}
.choice {
    align-horizontal: center;
    width: 50%;
    margin: 0 0;
    height: auto;
}
/* no_margin.tcss */

#button_container {
    align-horizontal: center;
    height: 9;
}

/* 选中 #button_container 下所有的 Horizontal 子元素 */
#button_container > Horizontal {
    margin-top: 0;
    margin-bottom: 0;
    align-horizontal: center;
    width: 40%;
}