Increase default text pixel width before word wrapping

Hi, I am displaying label names on my pages using forms editor. All of label name (for example: If under 18, name of guardian) should be displayed in single line without wrapping. Currently my label names are being wrapped and are showing as following on my page: If under 18, name of guardian How to increase pixel width so that all of the label name can be displayed in a single line like your webpage showing "Notify me of follow-up replies via email" after checkbox in single line? Thanks.