.banner{
    width: 100%;
    height: 300px;
    object-fit: cover;
}
.fullwidth{
    width: 100%;
}
.normal{
    max-width: 70%;
    max-height: 500px;
}

@media (max-width:768px) {
    .normal{
        max-width: 100%;
        max-height: 400px;
    }
}