HTMLify

body {
    display: grid;
    place-items: center;
    height: 100vh;
    background: #151515;
    font-family: "Poppins", sans-serif;
    font-size: 27px;
    font-weight: 700;
    line-height: 1.5;
}

a {
    text-decoration: none;
    color: #fff;
    font-weight: 700;
    position: relative;
}

a::before {
    content: '';
    background-color: hsla(196, 61%, 58%, .75);
    position: absolute;
    left: 0;
    bottom: 3px;
    width: 100%;
    height: 8px;
    z-index: -1;
    transition: all .3s ease-in-out;
}

a:hover::before {
    bottom: 0;
    height: 100%;
}