div.jsterm {
    border: 3px solid black;
    display: inline-block;
}
.jsterm span {
    background: black;
    color: #ccc;
    white-space: pre;
    font-family: courier new;
    font-weight: bold;
}
.jsterm-cursor {
    background: #ccc;
    display: none;
    position: absolute;
}