body{font-family:sans-serif;margin:0}header{font-size:.8rem;padding:18px}header.light-theme{background-color:#e0f2fe;color:#0c4a6e}header.dark-theme{background-color:#075985;color:#e0f2fe}.container{background-color:#f0f9ff;height:100vh}.container.light-theme{background-color:#f0f9ff;color:#0c4a6e}.container.dark-theme{background-color:#0c4a6e}button.light-theme{background-color:#f0f9ff;color:#0c4a6e;border:1px solid #0C4A6E}button.dark-theme{color:#f0f9ff;background-color:#0c4a6e;border:1px solid #F0F9FF}button{padding:6px 12px;border-radius:6px;cursor:pointer;font-weight:700;margin-left:1rem;margin-top:1rem}