Search submit button not aligned

I noticed that when I enable search, the submit button is lower than the text input field. I tweaked my style.css

.form-submit {
color:#000;
font-size:10px;
/* kjh: */
margin: 5px 0 10px 0;
}

margin was 10px 0 0 0;

The third one (bottom) is what fixes the alignment with the text input and I changed the first one (top) because I think it looks a tad better with smaller margin.