@font-face {
      font-family: 'fontello';
      src: url('./cui.ttf')  format('truetype');
      font-weight: normal;
      font-style: normal;
    } 

    .demo-icon {
      font-family: "fontello";
      font-style: normal;
      font-weight: normal;
    }
    
    .arrow-left::before {
      content: "\e800";
    }