This is what I use in Firefox and Google Chrome.

h1, h2, h3, h4, h5, h6 {font-family: 'times new roman', arial, verdana, helvetica, serif; background-color:none;
font-style:normal; font-variant:normal; font-weight:normal; margin:14px 0 4px 10px;}
h1{font-size: 1.22em;}
h2{font-size: 1.12em;}
h3{font-size: 1.02em;}
h4{font-size: 0.92em;}
h5{font-size: 0.91em;}
h6{font-size: 0.9em;}

These lines don't work in IE.

Does anybody have any suggestions, please?