button.navbar-toggler .burger-menu span {
    background-color: white;
}
button.navbar-toggler.collapsed .burger-menu span {
    background-color: black;
}
.burger-menu {
    width: 40px;
    height: 16px;
}
.burger-menu span {
    height: 2px;
}
/* Espace 5px */
.burger-menu span:nth-child(1),
.burger-menu span:nth-child(2),
.burger-menu span:nth-child(3),
.burger-menu span:nth-child(4) {
    top: 7px;
}
.collapsed .burger-menu span:nth-child(4) {
    top: 14px;
}