@font-face {
     font-family: 'CircularBook';
     src: url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.eot');
     src: local('CircularBook'),
          url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.eot?#iefix') format('embedded-opentype'),
          url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.woff2') format('woff2'),
          url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.woff') format('woff'),
          url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.ttf') format('truetype'),
          url('https://www.boldbrain.ch/webfont/circularstd-book-webfont.svg#circular_stdbook') format('svg');
     font-weight: normal;
     font-style: normal;
     font-display: swap;
}