style.css

@font-face {
  font-family: 'Slabo 27px';
  font-style: normal;
  font-weight: 400;
  src: local('Slabo 27px'),
       local('Slabo27px-Regular'),
       url(moz-extension://__MSG_@@extension_id__/fonts/Roboto-Regular.ttf) format('ttf')
       url(chrome-extension://__MSG_@@extension_id__/fonts/Roboto-Regular.ttf) format('ttf');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}


#speed-read-container {
    background: #ffffff;
    z-index: 999999;
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    display: none;
}
#speed-read-container.active {
    display: block;
}
#speed-read-center-text {
    font-family: 'Slabo 27px';
    top: 50%;
    left: 50%;
    position: absolute;
    transform: translate(-50%,-50%);
    font-size: 3em;
}
#speed-read-time-remaining {
    font-family: 'Slabo 27px';
    font-size: 1em;
    font-stretch: ultra-condensed;
    line-height: 0;
    vertical-align: middle;
    font-weight: bold;
    margin-left: 1em;
}
.speed-read-nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 10px 15px 0;
    line-height: 1;
}
.speed-read-button-group svg {
    width: 3em;
    height: 3em;
    vertical-align: middle;
}
.speed-read-button-group span {
    cursor: pointer;
}
.speed-read-float-left {
    float: left;
}
.speed-read-float-right {
    float: right;
}
.speed-read-clearfix {
    clear: both;
}
.speed-read-range {
    display: block;
    width: 100%;
}
.speed-read-range input {
    width: 100%;
}
.speed-read-range input:active,
.speed-read-range input::-moz-focus-outer {
    outline: none;
    border: none;
}
.speed-read-image-caption {
    font-size: .3em;
    font-weight: bold;
    text-align: center;
}

@media print {
    #speed-read-container.active {
        display: none !important;
    }
}