HTML

<header class="header">
        <nav class="header__menu">
            <a href="#" class="header__menu__link">Home</a>
            <a href="#"class="header__menu__link">Sobre mí</a>
        </nav>
    </header>

CSS

.header{
    display: flex;
    align-items: center;
    margin: 30px 50px;
    justify-content: space-between;
}

.header__menu{
    width: 615px;
    display: flex;
    flex-direction: row;
    gap: 40px;
}

.header__menu__link{
    text-decoration: none;
    font-family: "Montserrat", sans-serif;
    font-size: 24px;
    font-weight: 400;
    color: #f6f6f6;
    width: 130px;
    text-align: center;
    padding: 7px;
}

.header__menu__link:hover{
    border-top: 2px solid #22D4FD;
    border-bottom: 2px solid #22D4FD;
    border-radius: 5px;
}

RESULTADO