style.css

body {
    font-family: Arial, Helvetica, sans-serif;
    width: 80%;
    margin: 5% auto;
}

h1 {
    border-bottom: 1px solid black;
}

#page-header h1 {
    border-bottom: none;
    text-align: center;
}

#page-header {
    padding-bottom: 1.5rem;
    border: 1px dashed green;
    background-color: lightgreen;
}

img {
    display: block;
    margin: auto;
    width: 80%;
    padding: 4px;
    border: 1px solid lightgrey;
    border-radius: 8px;
    box-shadow: 0 4px 8px 0 grey;
    background-color: white;
}

img:hover {
    box-shadow: 0 8px  16px 0 grey;
}

a {
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul, ol, p {
    line-height: 1.75rem;    
}