html{
    font-family:Arial, Helvetica, sans-serif;  
    font-size: 16px;
}

body{
    width: 100%;
    height: 100vh;
    padding: 0%;
    border: 2px solid darkgreen;
}

header{
    width: 100%;
    margin: 0rem;
    padding: .01rem 0%;
    color: white;
    background-color: darkgreen;
}
footer{
    width: 100%;
    margin: 0rem;
    padding: .1rem 0%;
    color: white;
    background-color: darkgreen;
}
header h1, h2, h3, h4 {
    text-align: center;
}
main{
    padding: 0 0; 
}

footer p{
    text-align: center;
}
nav{
    color: white;
    background-color: black;
    padding: .25rem;
}
nav ul{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

nav > ul > li{
    display: inline-block;
    position: relative;
}
nav ul li a{
    padding: 10px 20px;
    text-decoration: none;
    color: white;
    display: inline-block;
    font-weight: bold;
}
button {
    color: white;
    background-color: darkgreen;
}