materio-base-d7/editors/css/tinymce-2.css

/**
 * TinyMCE 2.x
 */
table.mceEditor {
  clear: left;
}

/**
 * Align all buttons and separators in a single row, so they wrap into multiple
 * rows if required.
 */
.mceToolbarTop a, .mceToolbarBottom a {
  float: left;
}
.mceSeparatorLine {
  float: left;
  margin-top: 3px;
}
.mceSelectList {
  float: left;
  margin-bottom: 1px;
}
/* Place table plugin buttons into new row */
#mce_editor_0_table, #mce_editor_1_table {
  clear: left;
}