.container {
    display: grid;
    grid-template-columns: 16rem 1fr 5rem;
    grid-template-rows: 5rem 1fr 2rem;
    grid-template-areas: 
        "header header header"
        "nav main sidebar"
        "footer footer footer";
    min-height: 100vh;
}

body {
    height: 100%;
    background-size: cover;
    margin: 0;
    font-family:arial, "lucida console", sans-serif;
}

header {
    grid-area: header;
    padding: 2rem;
    background-color: #636363;
}

nav {
    color: white;
    grid-area: nav;
    background-color: #7e7e7e;
}

main {
    grid-area: main;
    padding: 2rem;
    background-color: darkgray;
}

aside {
    grid-area: sidebar;
    padding: 2rem;
    background-color: darkgrey;
}

footer {
    grid-area: footer;
    padding: 2rem;
    background-color: blue;
}

ul {
    padding-left: 0;
    list-style-type: none;
}

ul li {
    text-indent: 5px;
    background-color: #7e7e7e;
}

ul li ul li {
    text-indent: 25px;
    background-color: #969696;
}

select {
    border: 1px solid black;
    margin: 2px;
}

input[type=text]{
    border: 1px solid black;
    width: 170px;
    outline: none;
    margin:2px;
}

input[type=submit]{
    border: 1px solid black;
    margin: 2px;
}

tfoot{
    font-weight:bold;
}

table td{
    vertical-align: top;
}