@media (min-width:600px) and (max-width:900px) {
    header {
        justify-content: center;
        align-items: center;
        background-color: ;
        border-bottom: 1px solid rgb(216, 216, 216);
    }

    header img {
        background-color: ;
        width: auto;
        height: 70px;
    }
    header nav {
        position: relative;
        background-color: rgb(255, 255, 255);
    }
 .gambar1 img {
        width:100%;
        max-width: 600px;
    }
}