.viewer-container .viewer-toolbar {
    width: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.viewer-container .viewer-toolbar > li {
    height: 34px;
    width: 34px;
}

    .viewer-container .viewer-toolbar > li:before {
        margin: 7px;
    }

    .viewer-container .viewer-toolbar > li:nth-child(3),
    .viewer-container .viewer-toolbar > li:nth-child(4),
    .viewer-container .viewer-toolbar > li:nth-child(8),
    .viewer-container .viewer-toolbar > li:nth-child(9),
    .viewer-container .viewer-toolbar > li:nth-child(10),
    .viewer-container .viewer-toolbar > li:nth-child(11) {
        display: none;
    }

    .viewer-container .viewer-toolbar > li:nth-child(6):before {
        margin: 7px;
        background: url(/Content/images/full-screen.png);
    }