body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #35424a;
    color: white;
    padding: 1rem 0;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
    text-align: center;
    background-color: #4CAF50;
}

nav ul li {
    display: inline;
    margin: 0 1rem;
}

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

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

main {
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
    background-color: white;
    padding: 1rem;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

section h2 {
    color: #35424a;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1rem auto;
}

.back{
    position: absolute;
    left: 30px;
    top: 5%;
    border: #4CAF50 1px solid;
    border-radius: 5px;
    background-color: cornflowerblue;
    
}

.back a{
    text-decoration: none;
    color: #f4f4f4;
}