body{
    border: 1px solid red;
    width: 800px;
    margin: 20px auto;
    background-image: url(./assets/dark_bg.gif);
    background-repeat: repeat;
}

.cabecalho{
display: flex;
justify-content: center;
padding: 20px;
}

.container{
    display: flex;
}

#listL{
    border: 1px solid green;
    color: white;
    width: 150px;
}

#main{
    border: 1px solid  cadetblue;
    margin: 0 auto;
    width: 500px;
}

#listR{
    border: 1px solid green;
    color: white;
    width: 150px;
}

#main_img{
    display: block;
    margin: 20px auto;
    width: 100%;
}

.side_img{
    justify-content: center;
    align-items: center;
    display: flex;
    margin: 0 auto;
}