body{

    font-family: 'Noto Sans TC', sans-serif;

    font-weight: 300;

}

.fw_300{

    font-weight: 300;

}

.fw_500{

    font-weight: 500;

}

.fw_700{

    font-weight: 700;

}

.fw_900{

    font-weight: 900;

}



.box_16to9:after {

    content: "";

    display: block;

    padding-bottom: calc(100%*9/16);

}