.activa {
    display: inline-block;
    padding: 0 1em;
    background: #fff;
    border: 1px solid #007ab2;
    border-radius: 3px;
    font-size: 13px;
    line-height: 28px;
    color: #007ab2;
    text-decoration: none;
}

<a class="cmp_button_active">ACTIVA</A>