article{
    margin: 15px;
}
article>div:first-child{
    margin: 20px 10px;
}
article>div.fila{
    margin: 40px 10px;
    display:flex;
    flex-direction: row;
    flex-wrap: wrap;
    width: 100%;
    gap: 2em;
}
article>div.fila>div.columna{
    display: flex;
    flex-direction: column;
    flex-basis: 100%;
    flex: 1;
}
article>div.fila>div.columna>strong{
    font-weight: 700;
    margin-bottom: 10px;
}
article>div.fila>a{
    min-width: 200px;
    text-align: center;
    color: #fff;
    text-transform: uppercase;
    font-size: 1em;
    font-weight: 700;
    padding: 15px;
    display: block;
    margin-top: 20px;
    margin-bottom: 20px;
    margin-left: 5px;
    margin-right: 5px;
    text-decoration: none;
    background: #337ab7;
    border: 1px solid #337ab7;
    position: relative;
}
article>div.fila>a:hover{
    background: #fff;
    color: #337ab7;
}

article>div.fila:last-child{
    justify-content: center;
}