@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@100;400&display=swap');
html, body, #containera {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    font-family: 'Roboto', sans-serif;
    background-color:antiquewhite;
}

#containera {
    display: table;
}

#containerb {
  display: table;
    display: table-cell;
    margin: 0;
    padding: 0;
    text-align: center;
    vertical-align: middle;
}

#containerb {
    width: 100vw;
    margin: auto;
    
}