This margin-left: 26px is the "calculated style" of your design margin - left: 2em. Therefore, why is it in the Computed Style section of the Safari Web Inspector. Therefore, if you change the margin on the left to some other values, the pixel value in the computed style will also change.
In any case, there really is an additional supplement! And this is caused by the user agent stylesheet (-webkit-padding-start: 40px). Reset this style by installing the addition: 0 on your ol and any other elements you want.
A good way to prevent this problem from happening again and develop without worry is to reset your css. Basic Reset will be:
* { margin:0; padding:0; }
Jason
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