.panel-heading [data-toggle]:not(.collapsed):after {
    content: "";
    float: right;
    font-size: 18px;
    line-height: 22px;
    background: url("https://images.ctfassets.net/8ciosupf5c48/5DaUw719EnPHRITExyVAoH/19cdf94766597060df88e7b13a51a34e/0e6b7da21226-expanded.jpg?fm=webp&q=75") 0 0 / contain;
    width: 15px;
    height: 10px;
  }

  .panel-heading [data-toggle].collapsed:after {
    content: "";
    float: right;
    font-size: 18px;
    line-height: 22px;
    background: url("https://images.ctfassets.net/8ciosupf5c48/1RJsABkPuyGiYwJR9gMmQr/1b4a229bc0ec366a2bb90426f3296669/f0b4de8672c4-collapsed.jpg?fm=webp&q=75") 0 0 / contain;
    width: 15px;
    height: 10px;
  }