.navbar-default {
    background-color:#eeeeee;
}
.navbar-dark .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'><path stroke='rgba(25, 25, 25, 0.5)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>")
}