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

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem 0;
}

header nav ul {
    display: flex;
    justify-content: center;
    list-style-type: none;
}

header nav ul li {
    margin: 0 20px;
}

header nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

header nav ul li a:hover {
    text-decoration: underline;
}

main {
    padding: 20px;
}

h1 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

ul {
    list-style-type: none;
    padding-left: 20px;
}

ul li {
    margin-bottom: 10px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

section p {
    text-align: justify;
    padding-left: 20px;
}

section ul li p {
    text-align: justify;
    padding-left: 0px;
}

a {
    text-decoration: none; 
    
   }

@media screen and (max-width: 660px) {
  header nav ul {
    float: none;
    display: block;
    text-align: left;
  }
}