body {
  background-color: #000;
}
.container-header {
  background-color: #000000; /* Replace with your desired color */
  background-image: none;    /* Optional: remove gradient or image */
}

.container-header .mod-menu {
  color: #ffffff; /* Adjust menu text color for contrast */
}

.container-header .navbar-toggler {
  color: #ffffff;
  border: 1px solid #ffffff;
}