header {
    position: absolute;
    top: 0;
    z-index: 3;
    width: 100%;
  }

.head-nav a {
    color: #ffffff;
}

.head-logo img, img.icon-search {
    filter: brightness(0) invert(1);
}
.cart .cart__icon {
    background: url(../image/icon_bag_white_siena.svg) center center no-repeat;
}
.dropdown-content button {
    color: #ffffff;
    font-weight: bold;
}

@media screen and (max-width: 650px) {
    .head-nav a {
     color: #002857; 
    }
    .login .menu img {
        filter: brightness(0) invert(1);
    }
    .dropdown-content button {
        color: #002857;
        font-weight: bold;
    }
}