.peh-viewer-pdf-link{
    font-size: 2rem;
    margin-right: 2rem;
}

.peh-viewer-navigate-element{
    width: 52px;
    height: calc(100vh - 90px);
    border: none;
    font-size: 3rem;
    background-color: lightgray;
}

a.peh-viewer-navigate-element{
    display: flex;             /* establish flex container */
    align-items: center;       /* center ul container vertically */
    justify-content: center;
    text-decoration: none;
}

.peh-viewer-img-model{
    width: 100%;
}

#peh-viewer-exercise-container{
    max-height: calc(100vh - 90px);
    overflow-x: hidden;
    overflow-y: auto;
}


@media (max-width: 768px){
    .container, .container-sm {
        max-width: 100vw;
    }
}