Tinymce width problems - CSS snippet

We have had a few sites recently on which TinyMCE was playing up on narrow themes. The buttons where not breaking onto new lines, causing the TinyMCE textarea to be much too wide.

We solved the problem with the following snippet of CSS

.mceToolbarTop * {
float:left;
}

.mceToolbarTop select {
width:auto!important;
}

.mceToolbarTop option {
float:none;
}