@media screen and (max-width: 1200px){
    html body main{
        padding: 25px 2%;
    }
    #bloc_live{
        flex-direction: column;
    }
    #video_bloc{
        flex:0 0 100%;
        height: auto;
        margin-bottom: 25px;
    }
    #question_bloc{
        flex:0 0 100%;
    }
}