overleaf/services/web/frontend/stylesheets/bootstrap-5/pages/editor/file-view.scss

.file-view {
  padding: var(--spacing-05);
  text-align: center;
  overflow: auto;

  .loading-panel {
    padding-top: 8rem;
    background: var(--neutral-10);
  }

  .file-view-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-03);
    justify-content: center;
  }

  .file-view-error {
    margin: var(--spacing-08) auto auto;
    max-width: 400px;
    text-align: left;
  }

  img,
  .file-view-pdf {
    max-width: 100%;
    max-height: 90%;
    display: block;
    margin: var(--spacing-05) auto auto;
    border: 1px solid var(--neutral-60);
    box-shadow: 0 2px 3px var(--neutral-60);
    background-color: var(--white);
  }

  .file-view-pdf {
    overflow: auto;
    width: max-content;
    display: flex;
    flex-direction: column;
    align-items: center;

    .pdf-page:not(:last-of-type) {
      border-bottom: 1px solid var(--neutral-60);
    }
  }

  .linked-file-icon {
    color: var(--blue-50);
  }

  .no-preview {
    color: var(--neutral-60);
    font-size: var(--font-size-06);
    margin-top: var(--spacing-06);
  }

  .text-preview {
    margin-top: var(--spacing-05);

    .scroll-container {
      background-color: var(--white);
      font-size: 0.8em;
      line-height: 1.1em;
      overflow: auto;
      border: 1px solid var(--neutral-30);
      padding: var(--spacing-04) var(--spacing-05);
      text-align: left;
      white-space: pre;
      font-family: monospace;
    }
  }
}

.full-size,
.loading-panel {
  position: absolute;
  inset: 0;
}

.no-history-available,
.no-file-selection-message,
.multi-selection-message {
  width: 50%;
  margin: var(--spacing-10) auto;
  text-align: center;
}

.pdf-empty,
.no-history-available,
.no-file-selection,
.multi-selection-ongoing {
  &::before {
    @extend .full-size;

    left: 20px;
    content: '';
    background: url(../../../../../public/img/ol-brand/overleaf-o-grey.svg)
      center / 200px no-repeat;
    opacity: 0.2;
    pointer-events: none;
  }
}