.container-header {
  background-color:  #2c3c5c;
  background-image: none;
}
        body {
            background: white		/* background of your website */

        }
.container-header .mod-menu {
   justify-content: center;
  background-color:  rgb(44, 60, 92);
   color:  #f2f4f4 ;
  background-color:  #4599d6;
   background-color:  #2c3c5c);
   padding: 0;
}