locate following code in your css

h2, h3, h4, h5, h6 {stylesheet.css (line 34)
color:#999999;
}

add following code after color

margin:0.1em;

h2, h3, h4, h5, h6 {
color:#999999;
margin:0.1em;
}

this should fix the alignment , however , do test by looking at your page , if there are some issue after adding margin , that you can break that code block into two , and only applying margin to H4 tag ..