.center{
     display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    flex-direction: column;
    height: 90vh;
    color: white;
    background-image: linear-gradient(
        0deg,
        rgba(0,0,0,0.5),
        rgba(0,0,0,0.5)
    )
    ,url("img/logo2.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
}

.btn-conocenos{
    display: inline-block;
    padding: 12px 20px;
    background-color:#2E8B57 ;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    cursor: pointer;
}