* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
}

.app {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #2196f3;
    color: white;
    padding: 1rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.content {
    background-color: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    margin-bottom: 0.5rem;
}

h2 {
    color: #2196f3;
    margin-bottom: 1rem;
}