@font-face {
   font-family: 'OPPOSans-R';
   font-display: swap;
   src: url('OPPOSans-R/font.woff');
}
@font-face {
   font-family: 'OPPOSans-B';
   font-display: swap;
   src: url('OPPOSans-B/font.woff');
}