.panel-default>.panel-heading {
    color: #333;
    /*background-color: #fff;*/
    border-color: #e4e5e7;
    padding: 0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    text-align: center;
  }
  
  .panel-default>.panel-heading a {
    display: block;
    padding: 10px 15px;
    color: black;
  }
  
  .panel-default>.panel-heading a:after {
    content: "";
    position: relative;
    top: 1px;
    display: inline-block;
    font-family: 'Glyphicons Halflings';
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    float: right;
    transition: transform .25s linear;
    -webkit-transition: -webkit-transform .25s linear;
  }
  
  /*.panel-default>.panel-heading a[aria-expanded="true"] {
    background-color: #fff;
  }*/
  
  .panel-default>.panel-heading a[aria-expanded="true"]:after {
    content: "\2212";
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
  }
  
  .panel-default>.panel-heading a[aria-expanded="false"]:after {
    content: "\002b";
    -webkit-transform: rotate(90deg);
    transform: rotate(90deg);
  }

  /*.panel-default>.panel-heading {
    border-top: 1px solid lightgray;
    border-bottom: 1px solid lightgray;
  }*/

  /*.panel-default {
    border: 1px solid gray;
    border-radius: 5px;
    padding: 20px;
  }*/

  .panel-body {
    padding: 15px;
  }

  .panel-odd {
    background-color: rgb(248, 249, 250);
  }

  .panel-even {
    background-color: #fff;
  }