* {
    font-family: Calibri, sans-serif;
}
body {
    margin: 0;
    padding: 0;
}

nav {
    width: 100%;
    position: fixed;
    top: 0;
    background-color: white;
    height: auto;
}

nav ul {
    margin: 1em 10%;
    display: flex;
    list-style: none;
    justify-content: space-between;
}

nav ul li {
    text-transform: uppercase;
}

nav ul li a {
    text-decoration: none;
    color: black;
    font-size: 1.25rem;
}

nav ul li a:hover {
    font-weight: 700;
}

.green {
    color: #63b1a9;
}

.brown {
    color: #a8847d;
}

main {
    margin: 4em 0;
}

.gray-background {
    background: rgba(0, 0, 0, 0.4);
}

h1 {
    padding: 0.5em 0.5em;
    margin: 0 auto;
    width: fit-content;
    text-align: center;
    color: #63b1a9;
    text-transform: uppercase;
    font-size: 3rem;
}

h2 {
    text-align: center;
}

ul {
    list-style-type: none;
}

nav hr {
    border: 3px solid black;
    width: 90%;
    padding: 0;
    margin: 0 auto;
}

.text-center {
    text-align: center;
}

#course,
#vision,
#reality,
#reality-2 {
    min-height: 1080px;
    background-position: center;
    background-clip: border-box;
    width: 100%;
    background-size: cover;
}

#course {
    background-image: url('images/image1.jpg');
}

#vision {
    background-image: url('images/image2.jpg');
}

#reality {
    background-image: url('images/image3.jpg');
}

#reality-2 {
    background-image: url('images/image5.jpg');
}

p {
    font-size: 1.25rem;
}

section#imprint {
    padding: 0 10%;
}
section#imprint p,
section#imprint ul li {
    font-size: 0.75rem;
}

img.offer {
    width: 100%;
}