nav ul ul {display: none;}

nav ul li {display: inline;}

nav ul li:hover > ul{display: inherit;}

h1 {font-family: arial}

header {font-family: arial;}

body {font-family: arial; justify-content: center; align-items: center; height: 100px; margin: 0; background-color: aliceblue}
 
img {display: block; margin-left: auto; margin-right: auto;}

h1 {text-align: center;}

ul {text-align: center;}

p {text-align: center; padding: 20px; border-radius: 10px; background-color: lightsteelblue; max-width: 600px; margin 20px; text-align: center; font-family: "Arial"; margin-left: auto; margin-right: auto; font-weight: 600}

header {background-color: lightsteelblue;}

li {list-style-type: none;}

h2 {text-align: center;}

h3 {text-align: center; border-left: 50%;}

footer {text-align: center;}

.flex-container {display: flex; width: 50%; margin-left: auto; margin-right: auto;}

.flex-container img {height: auto;}