* {
    margin: 0px;
}

body {
    display: grid;
    grid-template-areas:
    "header header"
    "nav main"
    "footer footer";

    grid-template-columns: 15vw auto;
    grid-template-rows: 15vh 70vh 15vh;
}

header {
    grid-area: header;
    background-color: greenyellow;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6vw;
}

nav {
    grid-area: nav;
    background-color: blue;
}

main {
    grid-area: main;
    background-color: yellow;
}

footer {
    grid-area: footer;
    background-color: orange;
}

img {
    height: 100%;
    width: 100%;
}

li {
    border: solid;
    background-color: whitesmoke;
    color: black;
    padding: 15px 32px;
    display: inline-block;
    font-size: 16px;
    margin: 4px 2px;
    cursor: pointer;
}