.header .menu_btn span, .header .menu_btn span::before, .header .menu_btn span::after {
    background: black;
}
.header.header_fixed .menu_btn span, .header .menu_btn span::before, .header .menu_btn span::after {
    background: #fff;
}
.header,
.header .logo .logo_wrap span {
    color: #000;
}
.header .logo .logo_wrap .img_block{
    background-image: url('../img/logo_blue.png');
}

.header .nav .menu_item a,
.mobile_navigation a {
    text-decoration: none;
    color: #000;
    position: relative;
    transition: all 0.2s ease;
}
.header.header_fixed .nav .menu_item a {
  color: #fff;
}
.header.header_fixed .logo .logo_wrap span {
    color: #fff;
}