body {
    font-family: Arial, Helvetica, sans-serif;
    background: linear-gradient(to right top, #e6f7f1, #d8f4f7, #d3eefc, #dce8ff, #edf2ff);
}

#wrapper {
    width: 1000px;
    margin-left: auto;
    margin-right: auto;
    border: 2px solid #000000;
}

header {
    background-color: #394856;
    color: #FFFFFF;
    text-align: center;
    padding: 8px;
}

nav {
    font-weight: bold;
    font-size: 1.25em;
    background-color: #d8feff;
    text-align: center;
    padding: 1px;
    border-top: 2px solid black;
    border-bottom: 2px solid black;
}

nav a {
    text-decoration: none;
    padding: 4px;
    color: #6d6d6d;
}

nav a:hover {
    color: #000000;
}

nav li {
    display: inline-block;
    text-align: center;
}

nav ul {
    list-style: none;
    padding: 0;
}

main {
    background-color: #f8f9fa;
    color: #000000;
    padding: 2em;
}

footer {
    background-color: #394856;
    color: #FFFFFF;
    text-align: center;
    padding: 10px;
    font-style: italic;
}

table {
    border: 1px solid black;
    border-collapse: collapse;
    width: 50%;
    margin: auto;
}

th, td {
    margin: 0px;
    padding: 3px;
    text-align: center;
}

th {
    background-color: #394856;
    color: white;
}

tr:nth-child(even) {
    background-color: #c1ffa9;
}