.tickercontainer { /* the outer div with the black border */
width: 400px; 
height: 20px; 
margin: 0; 
padding: 0
overflow: hidden; 
}
.tickercontainer .mask { /* that serves as a mask. so you get a sort of padding both left and right */
position: relative;
left: 10px;
top: 1px;
width: 400px;
overflow: hidden;
}
ul.newsticker { /* that's your list */
position: relative;
left: 400px;
font-weight: bold;
font-size: 14px;
list-style-type: none;
margin: 0;
padding: 0;

}
ul.newsticker li {
float: left; /* important: display inline gives incorrect results when you check for elem's width */
margin: 0;
padding: 0;
}
ul.newsticker a {
color: #920505;
white-space: nowrap;
padding: 0;
font-weight: bold;
font-size: 14px;
margin: 0 4px 0 0;
} 
ul.newsticker span {
margin: 0 4px 0 0;
}