bigbluebutton-Github/bigbluebutton-html5/imports/ui/components/presentation/download-presentation-button/styles.scss

.wrapper {
  position: absolute;
  left: 0;
  right: auto;
  background-color: var(--color-transparent);
  cursor: pointer;
  border: none !important;

  [dir="rtl"] & {
    left: auto;
    right: 0;
  }
}

.button {
  span, span:active, span:hover {
    background-color: var(--color-transparent) !important;
    border: none !important;
    i {
      border: none !important;
      background-color: var(--color-transparent) !important;
      font-weight: bold !important;
    }
  }
}

.light {
  top: 0;
}

.light .button span i {
  color: var(--color-white);
}

.dark {
  bottom: 0;
}

.dark .button span i {
  color: var(--color-black);
}