@media (max-width: 600px){

    .header{
        padding: 0;
        height: 220px;
        justify-content: space-around;
        gap: 30px;
    }

    .menu{
        flex-direction: column;
        gap: 15px;
        text-align: center;
        display: none;
        margin-top: 10px;
        transform: scale(0);
        transition: 2s ease-in-out;
    }

    .menu.active-mobile{
        display: flex;
        transform: scale(1);
        transition: 2s ease-in-out;
    }

    .hamburguer{
        display: block;
        order: 3;
        z-index: 1;
    }

    /* SEÇÃO COM GRID 1! */

    .grid_1{
        grid-template-columns: repeat(2, 1fr);
    }

    .grid_1 > div:nth-child(n+4){ /*Estilizando a partir do 4º item com seletor "nth child"*/
        display: block; 
    }

    .grid_1 > div.anuncio{
        grid-column: auto;
        grid-row: auto;
        order: -1;
    }

    /* SEÇÃO COM GRID 2! */

    .grid_2{
        grid-template-columns: 1fr;
    }

    .sidebar{
        display: flex;
        overflow: scroll;
    }

    .sidebar > div{
        flex: 1 0 200px;
        margin: 0 10px;
    }

    /* SEÇÃO COM GRID 3! */

    .grid_3{
        max-width: 80%;
    }

}