/* Media queries */
@media only screen and (max-width: 891px) {
    header {
        padding: 10px;
        -webkit-box-orient: vertical;
        -webkit-box-direction: normal;
            -ms-flex-direction: column;
                flex-direction: column;
    }
    header nav{
        display: flex;
        justify-content: space-evenly;
    }

    header nav ul li {
        display: block;
        margin: 10px 0;
    }
    .modal{
        height: 100%;
        padding-top: 20%;
    }
    aside {
        width: 100%;
    }

    .right_header {
        width: 100%;
        -webkit-box-pack: center;
            -ms-flex-pack: center;
                justify-content: center;
        margin-top: 20px;
    }

    .right_header .buttons {
        -ms-flex-wrap: wrap;
            flex-wrap: wrap;
    }
    .tetris{
        flex-direction: column-reverse;
        padding-left: 10px;
        padding-right: 10px;
        text-align: center;
    }
    section {
        padding-left: 10px;
        padding-right: 10px;
    }
    section p{
        text-align: center;
    }
    .section p{
        text-align: center;
    }
    footer{
        flex-direction: column;
    }
}