.collapsed-fieldset legend {
    cursor: pointer;
}

.collapsed-fieldset legend::before {
    content: '▶';
    display: inline-block;
    margin-right: 5px;
    transition: transform 0.3s;
}

.collapsed-fieldset .content-panel:not([style*="display: none"]) + legend::before {
    transform: rotate(90deg);
}