.ke-container-black .ke-toolbar .ke-icon-remoteimage {
    background-image: url(../img/download.png);
    background-size: 16px 16px;
}

.ke-container-black .ke-toolbar .ke-icon-search {
    background-image: url(../img/search.png);
    background-position: 0 0;
    background-size: 16px 16px;
}


.ke-container-black .ke-toolbar .ke-icon-math {
    background-image: url(../img/math.png);
    background-position: 0 0;
    background-size: 16px 16px;
}