lbry-desktop/src/ui/scss/component/_file-render.scss

.file-render {
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;

  overflow: hidden;
  position: absolute;
  z-index: 1;

  html[data-mode='dark'] & {
    border: 1px solid rgba($lbry-gray-1, 0.3);
  }
}

.file-render__viewer,
.document-viewer {
  background-color: $lbry-white;

  html[data-mode='dark'] & {
    background-color: transparent;
  }
}

.file-render__viewer {
  width: 100%;
  height: 100%;

  iframe,
  webview,
  .video-js {
    width: 100%;
    height: 100%;
  }

  // Removing the play button because we have autoplay turned on
  // These are classes added by video.js
  .video-js .vjs-big-play-button {
    display: none;
  }
}

.document-viewer {
  overflow: auto;

  .markdown-preview {
    height: 100%;
    overflow: auto;
    padding: var(--spacing-vertical-large);
  }
}

.code-viewer,
.document-viewer__content {
  width: 100%;
  height: 100%;
  overflow: auto;
}

// Code-viewer
.code-viewer .CodeMirror {
  width: 100%;
  height: 100%;
  min-height: 100px;

  .cm-invalidchar {
    display: none;
  }

  .CodeMirror .CodeMirror-lines {
    // is there really a .CodeMirror inside a .CodeMirror?
    padding: var(--spacing-vertical-small) 0;
  }

  .CodeMirror-code {
    @include font-mono;
    letter-spacing: 0.1rem;
  }

  .CodeMirror-gutters {
    background-color: $lbry-gray-1;
    border-right: 1px solid $lbry-gray-2;
    padding-right: var(--spacing-vertical-medium);
  }

  .CodeMirror-line {
    padding-left: var(--spacing-vertical-medium);
  }

  .CodeMirror-linenumber {
    color: $lbry-gray-5;
  }
}