h1 {
 color: pink;
 background-color: blue;
 border: 1px solid black;
 }
 body {
    font-family: Arial, sans-serif;
}

.horizontal-menu {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.horizontal-menu li {
    margin-right: 20px;
}

.horizontal-menu a {
    text-decoration: none;
    color: black;
    padding: 10px 15px;
    display: block;
}

.horizontal-menu a:hover {
    background-color: #f0f0f0;
    border-radius: 5px;
}