body { font-family: Tahoma; background: #f0f2f5; display: flex; justify-content: center; padding: 20px; }
.app-container { background: white; padding: 20px; border-radius: 12px; box-shadow: 0 4px 15px rgba(0,0,0,0.1); width: 300px; }
input { width: 70%; padding: 8px; border: 1px solid #ddd; border-radius: 5px; }
button { padding: 8px; background: #28a745; color: white; border: none; border-radius: 5px; cursor: pointer; }
ul { list-style: none; padding: 0; margin-top: 20px; }
li { padding: 10px; border-bottom: 1px solid #eee; font-size: 14px; }