.row-quienes-somos{
    margin: 50px 0px;
}

.unete{
    background-color: yellow;
    font-size: 30px;
    padding: 10px 20px;
    display: block;
    width: 100%;
    margin-bottom: 50px;
    text-align: center;
}

.unete:hover{
    color: #337ab7;
}

/*xs*/
@media (max-width: 767px){
    .row-quienes-somos{
        margin: 20px 0px;
    }
}