/* Element selector for h1 */

h1 {
    color: darkblue;
}

/* Class selector for elements with class="highlight" */

.highlight {
    background-color: lightgray;
    font-style: italic;
}

/* ID selector for elements with id="main-title" */

#main-title {
    text-align: center;
    border-bottom: 2px solid black;
}