.f1{
    position:fixed!important;
    left:0!important;
    width:25vw!important;
    height:100vh!important;
}

.f2{
    position:fixed!important;
    left:25vw!important;
    width:25vw!important;
    height:100vh!important;
}

.f3{
    position:fixed!important;
    left:50vw!important;
    width:25vw!important;
    height:100vh!important;
}

.f4{
    position:fixed!important;
    left:75vw!important;
    width:25vw!important;
    height:100vh!important;
}