.FileViewer, .ReportViewer {
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
    border: 0;
    box-sizing: border-box;
    display: block;
    overflow: hidden;
}

.FileViewerButton {
    position: absolute;
    background-color: transparent;
    cursor: pointer;
    top: 50%;
    height: 60px;
    width: auto;
    margin-top: -13px;
    padding: 8px;
    font-weight: bold;
    font-size: 30px;
    transition: 0.6s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    opacity: 0.85;
}

.FileViewerButton:hover {
    background-color: rgba(0,0,0,0.8);
}

.FileViewerButtonPrev {
    float: left;
    left: 27px;
    border-radius: 0 3px 3px 0;
}

.FileViewerButtonNext {
    float: right;
    right: 27px;
    border-radius: 3px 0 0 3px;
}