.collapsible-container{max-width:600px;margin:20px auto;padding:10px;border:1px solid #ccc;border-radius:8px;background-color:#f9f9f9}.collapsible{background-color:#f0f0f0;color:#333;padding:10px;width:100%;border:none;text-align:left;font-size:1.2em;cursor:pointer;border-radius:4px;display:flex;justify-content:space-between;align-items:center}.arrow{font-size:1em;transition:transform .3s ease}.content{padding:10px;display:none;background-color:#f0f0f0;border-radius:4px;margin-top:10px}@media (max-width:600px){.collapsible{font-size:1em}}