:root {
    --green-background: #708238;
    --white: #ffff;
    --nav: #9ABC49;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}
header {
    background-color: var(--green-background);
    color: var(--white);
    padding-top: 10px;
}
header p {
    font-size: 20px;
    padding: 10px;
}
main {
    background-color: var(--white);
    padding: 30px 20px;
    min-height: 100%;
}
footer {
    background-color: var(--green-background);
    padding: 30px;
    color: var(--white);
    bottom: 0;
    width: 100%;
}

img {
    width: 400px;
}

nav {
    line-height: 50px;
    background-color: var(--nav);
    cursor: pointer;
    padding: 0 10px;
    width: 100%;
}

nav li {
    display: inline-block;
}

nav li a {
    color: var(--white);
    text-decoration: none;
    margin: 20px;
}

nav li a:hover {
    opacity: 0.6;
}

ul {
    list-style: none;
}

li {
    margin: 5px;
}

.fa {
    padding: 20px;
    text-decoration: none;
    color: var(--white);
}
  
.fa:hover {
    opacity: 0.6;
}