body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0; /* Light gray using HEX value */
}

header {
    background-image: url('https://edube.org/uploads/media/default/0001/04/portfolio.jpg');
    background-repeat: no-repeat;
    background-position: center;
    background-color: cmyk(0, 100, 100, 0); /* Red using CMYK value */
    padding: 20px;
    text-align: center;
}

h1 {
    color: rgb(0, 128, 0); /* Green using RGB value */
}

h2 {
    color: hsl(210, 100%, 50%); /* Blue using HSL value */
    font-style: italic;
    text-decoration: underline;
}

main {
    background: linear-gradient(to bottom, lightblue, white);
}

section {
    margin: 20px;
}

ul {
    list-style-type: square;
}

li {
    line-height: 1.6;
    padding-left: 10px;
}

a:link {
    color: darkblue;
}

a:visited {
    color: purple;
}

a:hover {
    color: red;
}

img {
    width: 100%;
    max-width: 600px;
    border-radius: 10px;
    box-shadow: 5px 5px 10px gray;
}