threema-web/public/fonts/material.css

@font-face {
    font-family: 'Material Icons';
    src: local('Material Icons'),
         local('MaterialIcons-Regular'),
         url('MaterialIcons-Regular.woff2?v=1') format('woff2'),
         url('MaterialIcons-Regular.woff?v=1') format('woff');
    font-style: normal;
    font-weight: 400;
}

.material-icons {
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;  /* Preferred icon size */
    display: inline-block;
    line-height: 1;
    text-transform: none;
    letter-spacing: normal;
    word-wrap: normal;
    white-space: nowrap;
    direction: ltr;

    /* Support for all WebKit browsers. */
    -webkit-font-smoothing: antialiased;
    /* Support for Safari and Chrome. */
    text-rendering: optimizeLegibility;

    /* Support for Firefox. */
    -moz-osx-font-smoothing: grayscale;

    /* Support for IE. */
    font-feature-settings: 'liga';
}

/* Rules for sizing the icon. */
.material-icons.md-14 { font-size: 14px; }
.material-icons.md-18 { font-size: 18px; }
.material-icons.md-24 { font-size: 24px; }
.material-icons.md-36 { font-size: 36px; }
.material-icons.md-48 { font-size: 48px; }
.material-icons.md-96 { font-size: 96px; }
.material-icons.md-128 { font-size: 128px; }

/* Rules for using icons as black on a light background. */
.material-icons.md-dark { color: rgba(0, 0, 0, 0.87); }
.material-icons.md-dark.md-inactive { color: rgba(0, 0, 0, 0.26); }

/* Rules for using icons as white on a dark background. */
.material-icons.md-light { color: rgba(255, 255, 255, 1); }
.material-icons.md-light.md-inactive { color: rgba(255, 255, 255, 0.3); }

/* specific color masks */
.material-icons.user-dec {
    color: #ff9800;
}
.material-icons.user-ack {
    color: #4caf50;
}