#mainbody450 {
    display:  none;
    position: fixed;
    left:     calc(-10vw/19.20);
    height:   calc(1080vh/10.80);
    top:      calc(0vw/19.20);
    width:    calc(1920vw/19.20);
    z-index:  10;
}
#lefttopcontainer450 {
    height:   calc(1080vh/10.80);
    width:    calc(1920vw/19.20);
}
#rightbody_img450 {
    float:      left;
    height:     calc(1080vh/10.80);
    width:      calc(1920vw/19.20);
}