.panel-Cor {
    color: white;
    background-color: #635E98;
}

.panel-heading {
    padding: 0;
    border: 0;
}

.panel-title>a,
.panel-title>a:active {
    display: block;
    padding: 16px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    word-spacing: 3px;
    text-decoration: none;
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;

}

.panel-heading a:before {
    font-family: 'Glyphicons Halflings';
    content: "+";
    float: right;
    transition: all 0.5s;
}

.panel-heading.active a:before {
    -webkit-transform: rotate(180deg);
    -moz-transform: rotate(180deg);
    transform: rotate(180deg);
}