* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


body {
    font-family: Arial, sans-serif;

    margin: 0%;
    height: 100vh;

    display: flex;
    align-items: center;
    justify-items: stretch;
}



.screen-part {
    height: 100vh;

    display: flex;
    align-items: center;
    justify-content: center; 
}



.screen-part-edge {
    width: 30vw;
}



#div-center {
    width: 40vw;
}