CSS problem with the help strings under the Viewfield field

Hi,

On my website, I had a problem with the add page form which was exploded the width of my page.

The reason?
This css code brought by modules/system/system.theme.css:
tr.odd .form-item, tr.even .form-item {
white-space: nowrap;
}

Also, the help text enlarged the width of my form:
("A comma separated list of arguments to pass to the selected view. Any token from the placeholder token list may be used as an argument. (Wrap arguments containing commas in double quotes and replace double quotes in arguments with a pair of double quotes.)")

Can you add a css class in the css module to avoid it please, or maybe change the markup?
ie:
.field-type-viewfield tr.odd .form-item, .field-type-viewfield tr.even .form-item {
white-space: normal;
}

ThX.