@font-face {
  font-family: 'SourceSansPro-Regular';
  font-style: normal;
  font-weight: normal;
src:  url('https://wf.telsso.de/font/SourceSansPro-Regular.ttf') format('truetype'), url('https://wf.telsso.de/font/SourceSansPro-Regular.woff') format('woff'), url('https://wf.telsso.de/font/SourceSansPro-Regular.eot#iefix') format('embedded-opentype')}