matrix-spec-proposals/jsfiddles/example_app/demo.css

.roomListDashboard, .roomContents, .sendMessageForm {
    visibility: hidden;
}

.roomList {
    background-color: #909090;
}

.messageWrapper {
    background-color: #EEEEEE;
    height: 400px;
    overflow: scroll;
}

.membersWrapper {
    background-color: #EEEEEE;
    height: 200px;
    width: 50%;
    overflow: scroll;
}

.textEntry {
    width: 100%
}

p {
    font-family: monospace;
}

table
{
    border-spacing:5px;
}

th,td
{
    padding:5px;
}

.roomList tr:not(:first-child):hover {
    background-color: orange;
    cursor: pointer;
}