.tickercontainer { /* the outer div with the black border */

}
.tickercontainer .mask { /* that serves as a mask. so you get a sort of padding both left and right */
position: relative;
left: 8px;
top: 0px;
width: 207px;
overflow: hidden;
}
ul.newsticker { /* that's your list */
position: relative;
list-style-type: none;
margin: 0;
padding: 0;

}
ul.newsticker li {
width: 280px;
float: left; /* important: display inline gives incorrect results when you check for elem's width */
margin: 0;
padding: 0;
}