IE and Firefox margin problem

Problem: In a div tag you have another div tag and you wish to apply left margin. Let’s say you set it to 35px. You check it in IE and looks great. Then you go to Firefox and needless to say it’s obvious you would need to set it at a much higher number.

Solution:

For IE
#Author2{
margin-left: 35px;
}

For Firefox
#mainAuthorBox>#Author2 {
margin-left: 70px;
}