.panel {
    margin-bottom: 5px;
    background-color: transparent;
}

.panel-heading {
    padding: 0px;
    position: relative;
    cursor: pointer;
}

    .panel-heading:hover, .panel-heading.selected {
        background-color: #f2f2f2;
    }

.panel-title {
    margin-top: 0;
    margin-bottom: 0;
    padding: 0 5px;
    border-bottom:none;
}

.panel-body {
    padding: 10px;
    display: none;
}