list-builder .panel-footer {
    background-color: #fff;
    border: none;
    margin: 0;
    padding-top: 0;
}

list-builder .panel {
    padding: 0;
    margin-right: 1em;
    min-height: 400px;
}

list-builder .list-group {
    margin-bottom: 0.5em;
}