.cabecera{
    position: fixed;
    width: 100%;
    top: 0;
    background: #f9f9f9;
    z-index: 21;
}
.cabecera .menu{
    position: relative;
    max-width: 1920px;
    z-index: 10;
    margin: -1px auto 0;
    padding: 1px 0 0;
    overflow: visible;
}

@media screen and (min-width: 0) {
    .cabecera {
        justify-content: center;
        /* padding: 0 1rem; */
        font-size: 12px;
    }
    
}

@media screen and (min-width: 768px) {
    .cabecera {
        justify-content: space-between;
        padding: 0 5rem;
        font-size: 15px;
    }
}