/* Element selector */
body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: white;
}

h1 {
    color: darkblue;
}

h2 {
    color: navy;
}

p {
    line-height: 1.6;
}

img {
    max-width: 500px;
    border: 1px solid black;
}

/* Class selector */
.section {
    margin-top: 30px;
    margin-bottom: 30px;
}

/* ID selector */
#intro {
    background-color: lightblue;
    padding: 15px;
}