.bigScreenClass,
.normalScreenClass {
    height: 100%;
    display: block
}
.bigScreenClass {
    margin-left: auto;
    margin-right: auto;
    width: calc(100% - (100% / 3));
    
}
.normalScreenClass {
    margin-left: 0;
    margin-right: 0;
    width: 100%;
    
}