How can I separate 2 sidebar blocks from each other using a separator (space)?

[ProFifaLeagues]

goto your additional.css template and add

#sidebar_container .underblock {background: none; height: 10px;}
#sidebar_container > ul {
-moz-border-radius:0px;
-webkit-border-radius:: 0px;
-moz-box-shadow: none;
background-color:transparent;
border:0px;
}
#sidebar_container .block {
background-color:{vb:stylevar forum_sidebar_background.backgroundColor};
border:{vb:stylevar forum_sidebar_border};
-moz-border-radius:{vb:stylevar border_radius};
-webkit-border-radius: {vb:stylevar border_radius};
-moz-box-shadow:-2px 2px 2px {vb:stylevar shadow_color};
}