Bootstrap changing the navbar default style

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/* NavBar */
. navbar-default {
Background-color: #F8F8F8;
Border-color: #E7E7E7;
}
/* Title */
. Navbar-default. Navbar-brand {
Color: #777;
}
. Navbar-default. Navbar-brand:hover,
. Navbar-default. Navbar-brand:focus {
Color: #5E5E5E;
}
/* Link */
. navbar-default. Navbar-nav > li > a {
Color: #777;
}
. navbar-default. Navbar-nav > li > A:hover,
. navbar-default. Navbar-nav > li > A:focus {
Color: #333;
}
. navbar-default. Navbar-nav >. Active > A,
. navbar-default. Navbar-nav >. Active > A:hover,
. navbar-default. Navbar-nav >. active > A:focus {
Color: #555;
Background-color: #E7E7E7;
}
. navbar-default. Navbar-nav >. Open > A,
. navbar-default. Navbar-nav >. Open > A:hover,
. navbar-default. Navbar-nav >. Open > A:focus {
Color: #555;
Background-color: #D5D5D5;
}
/* Caret */
. navbar-default. Navbar-nav >. dropdown > A. Caret {
Border-top-color: #777;
Border-bottom-color: #777;
}
. navbar-default. Navbar-nav >. dropdown > A:hover. Caret,
. navbar-default. Navbar-nav >. dropdown > A:focus. Caret {
Border-top-color: #333;
Border-bottom-color: #333;
}
. navbar-default. Navbar-nav >. Open > A. Caret,
. navbar-default. Navbar-nav >. Open > A:hover. Caret,
. navbar-default. Navbar-nav >. Open > A:focus. Caret {
Border-top-color: #555;
Border-bottom-color: #555;
}
/* Mobile Version */
. Navbar-default. Navbar-toggle {
Border-color: #DDD;
}
. Navbar-default. Navbar-toggle:hover,
. Navbar-default. Navbar-toggle:focus {
Background-color: #DDD;
}
. Navbar-default. Navbar-toggle. Icon-bar {
Background-color: #CCC;
}
@media (max-width:767px) {
. Navbar-default. Navbar-nav. Open Dropdown-menu > li > a {
Color: #777;
}
. Navbar-default. Navbar-nav. Open Dropdown-menu > li > A:hover,
. Navbar-default. Navbar-nav. Open Dropdown-menu > li > A:focus {
Color: #333;
}
}

Bootstrap changing the navbar default style