body {
    margin: 0;
    display: flex;
    flex-direction: row;
    background-image: url("wallpapers.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
}

body>a {
    width: 50vw;
    background-color: rgba(0, 0, 0, 0.719);
    text-decoration: none;
    color: white;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 3em;
    font-weight: bold;
    text-align: center;
    line-height: 100vh;
    vertical-align: middle;

    transition-property: background-color font-size;
    transition-duration: 300ms;
}

body>a:hover {
    background-color: rgba(0, 0, 0, 0.800);
    font-size: 3.1em;
}