Using the "Stylish" plugin or similar custom CSS injection, you can substantially change how vote links look, along with adding space between their placement.
My vote links read '▲sig' for up-vote (signal), and empty line of separation, and then '▼din' for down-vote (noise).
/* remove arrow background images */
/* XXX Bug in chrome/webkit requires padding or margin */
div[title="upvote"],
div[title="downvote"] {
margin: 0px !important;
padding: 0px !important;
padding-right: 1ex !important;
text-align: center !important;
display: inline !important;
white-space: pre;
background: none !important;
background-image: none !important;
-moz-transform: none !important;
-webkit-transform: none !important;
-o-transform: none !important;
-ms-transform: none !important;
transform: none !important;
/* width: 6ex !important; */
/* width: 1ex !important; */
/* margin-right: 10px !important; */
}
/* use unicode text arrows */
div[title="upvote"]:after {
content: '▲sig' !important;
}
div[title="downvote"]:after {
content: '\A\A▼din' !important;
}
/* color unicode arrow text green-up, red-down */
a[id^="up"] {
color: #009900 !important;
}
a[id^="down"] {
color: #990000 !important;
}
/* highlight arrows on hover */
a[id^="up"]:hover {
color: #00ff00 !important;
}
a[id^="down"]:hover {
color: #ff0000 !important;
}