.panel
{
    margin-top: 15px;
}
.panel-title
{
    font-size: 18px;
    font-weight: 700;
}

.panel-default > .panel-heading
{
     font-weight: bold;
     background-color: #dddddd !important;
}

.panel-title > a:after {
     /* symbol for "opening" panels */
     font-family: 'Glyphicons Halflings';  /* essential for enabling glyphicon */
     content: "\e114";    /* adjust as needed, taken from bootstrap.css */
     float: right;        /* adjust as needed */
     color: grey;         /* adjust as needed */
}
.panel-title > a.collapsed:after {
     /* symbol for "collapsed" panels */
     content: "\e080";    /* adjust as needed, taken from bootstrap.css */
}