menu_block.css in Menu Block 5

/* Duplicate of core's .menu */
  ul.menu-list
  {
    list-style: none;
    border: none;
    text-align: left;
  }

  ul.menu-list li
  {
    margin: 0 0 0 0.5em;
  }

  ul.menu-list li.expanded,
  ul.menu-list li.collapsed,
  ul.menu-list li.leaf
  {
    list-style-type: square;
    list-style-image: url(menu-leaf.png); /* We don't style with expanded and collapsed images. */
    background: none; /* Override garland's tree styling. */
    padding: 0.2em 0.5em 0 0;
    margin: 0;
  }