stylesheet.css

/* Use a CSS selector to apply style(s) to at least one HTML tag  */
body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
}

/* Style the id  */
#main-header {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    /* Change at least two box model properties (padding, margin, etc.)  */
    padding: 20px; 
    margin-bottom: 20px;
}

/* Style the class applied to multiple elements  */
.content-section {
    background-color: white;
    width: 80%;
    margin: 0 auto 20px auto; /* Box model property  */
    padding: 20px;            /* Box model property  */
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Use a CSS selector to change the color of <a> when you hover  */
a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    color: #e74c3c;
}