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Do not use an object’s border properties to draw lines, boxes, or grids on your form. Some browsers may not line up borders exactly as they appear in a LiveCycle Designer ES preview. Objects may appear layered or may push other objects off their expected position.
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If users will be using Microsoft Internet Explorer, you can design your form with lines, rectangles, and circles to define the background. All other web browsers support only vertical and horizontal lines; therefore, rectangles and circles on your form design will not display at run time.
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If users will be using Opera browsers, design the fields slightly larger than you want them to be. Fields in Opera always have a sunken inner border. Any border styles that you apply will be placed around the outside of this border. Because the sunken border takes up space in the field, the fillable area will shrink.
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Create static text slightly larger than what seems to be required to accommodate the text. LiveCycle Designer ES and Acrobat may use different kerning than that of a particular web browser, and some text may not be displayed correctly.
See also 

Layout considerations for HTML forms