style.css

* {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    background-color: #000;
    color: #fff;
}

html {
    font-size: 62.5%;
}

header {
    display: flex;
    height: 10rem;
    margin: 0 10.8rem;
    align-items: center;
    justify-content: space-between;
}

header span {
    font-size: 3rem;
}

.unorder-menu {
    display: flex;
    list-style: none;
}

.menu-link {
    margin: 0 1rem;
    text-decoration: none;
    color: #c6e518;
    font-size: 2rem;
}

.menu-link:hover {
    color: #C7C7C7;
}

#snake {
    display: flex;
    align-items: center;
    justify-content: space-evenly;
}

#game-info {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

h1 {
    font-size: 3rem;
}

h1,
h2,
button {
    font-family: "Pixelify Sans", sans-serif;
}

#gameCanvas {
    border: 0.4rem solid gray;
}

button {
    display: block;
    margin: 2rem 0;
    padding: 1.4rem;
    background-color: #fff;
    color: #000;
    font-size: larger;
    border-radius: 10rem;
}

#game-info {
    height: 95vh;
    width: 95vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-size: 2rem;
    line-height: 3rem;
}

footer {
    display: flex;
    justify-content: center;
    margin-bottom: 4rem;
}