body { 
    font-family: Arial, sans-serif; 
    margin: 40px; 
    background-color: #f5f5f5; 
}

h1 { 
    color: #333;
    border-bottom: 2px solid #3498db; 
    padding-bottom: 10px; 
}

h2 { 
    color: #2c3e50; 
    margin-top: 30px; }

ul { 
    list-style-type: none; 
    padding: 0; }

li { 
    margin: 10px 0; 
    background: #fff; 
    padding: 15px; 
    border-radius: 5px; 
    box-shadow: 0 2px 4px rgba(0,0,0,0.1); 
}

a { 
    text-decoration: none; 
    color: #3498db; 
    font-weight: bold; 
    display: block; 
}

a:hover { 
    color: #2980b9; 
    text-decoration: underline; 
}

.category { 
    margin-bottom: 40px; 
}