main.css

* { box-sizing: border-box; }

.wrapper { width: 80%; margin: auto; }

.header { display: flex; background-color: grey; height: 50px; }

.headertext { margin: auto; color: white; font-family: arial; }

.main-area { margin-top: 5px; }

.navigation { background-color: white; flex-basis: 25%; margin-right: 5px; justify-content: space-between; display: flex; flex-direction: row; }

.navigation ul { padding: 20px; list-style: none; font-size: 2em; margin-top: 0px; font-family: arial; }

.navigation a { text-decoration: none; color: dimgrey; }

.navigation a:hover { color: black; }

.hero { background-color: black; flex-basis: 75%; height: 500px; display: flex; position: relative; }

.hero h2 { margin-top: 30px; margin-left: 30px; color: whitesmoke; font-family: arial; text-shadow: black 2px 2px 8px; font-size: 5vw; position: absolute; }img:hover { opacity: 0.6; }

.hero img { width: 100%; height: 100%; object-fit: cover; }

.three-column { background-color: white; display: flex; flex-wrap: wrap; }

.column1 { padding: 10px; flex-basis: 200px; flex-grow: 1; background-color: grey; margin-top: 5px; border: 5px solid white; }

.column2 { padding: 10px; flex-basis: 200px; flex-grow: 1; background-color: grey; margin-top: 5px; border: 5px solid white; }

.column3 { padding: 10px; flex-basis: 200px; flex-grow: 1; background-color: grey; margin-top: 5px; border: 5px solid white; }

.footer { background-color: gray; color: white; text-align: center; height: 30px; margin-top: 20px; padding-top: 8px; font-size: 10px; }@media (min-device-width: 800px)

{.main-area { display: flex; height: 500px; margin-top: 5px; }}@media (min-device-width: 800px)

{.hero h2 { margin-top: 50px; margin-left: 50px; color: whitesmoke; font-family: arial; text-shadow: black 2px 2px 8px; font-size: 3vw; }}@media (min-device-width: 800px)

{.three-column { background-color: white; display: block; }}