* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header nav img {
    width: 60px;
    height: 60px;
    border: 2px rgb(0, 0, 0) solid;
    border-radius: 50%;
}

article section {
    display: flex;
    align-items: center;
    height: 50vh;
}

header nav {
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    display: none;
    border: 3px black solid;
    background-color: #fff;
}

header nav a {
    display: block;
    margin: 20px;
    height: 59px;
    width: 59px;
}