client/securedrop_client/resources/css/file_download_button.css

QPushButton#FileWidget_download_button {
    border: none;
    font-family: 'Source Sans Pro';
    font-weight: 600;
    font-size: 13px;
    color: #2a319d;
}

QPushButton#FileWidget_download_button:hover {
    color: #05a6fe;
}

QPushButton#FileWidget_download_button_animating {
    border: none;
    font-family: 'Source Sans Pro';
    font-weight: 600;
    font-size: 13px;
    color: #05a6fe;
}

QPushButton#FileWidget_download_button_animating:hover {
    color: #05a6fe;
}