@media(max-width:960px) {
	.navbar-fixed {
		top: 0;
		z-index: 100;
		position: fixed;
		width: 100%;
	}

	#banner {
		width: 100%;
		height: 120px;
		background-color: #f1f1f1;
		overflow: hidden;
		text-align: center;
	}

	#nav_bar {
		border: 0;
		margin-bottom: 0;
		height: 30px;
	}

	.navbar-brand {
		width: 100%;
		text-align: center;
		color: black;
		margin-top: 16px;
	}

	.nav-links {
		list-style-type: none;
		margin: 0;
		padding: 0;
		overflow: hidden;
		background-color: #333;
		//position: fixed;
		width: 100%;
			z-index: 100;

	}

	.nav-links li {
		float: left;
	}

	.nav-links li a {
		display: block;
		color: white;
		text-align: center;
		padding: 14px 16px;
		text-decoration: none;
		font-weight: bold;
	}

	.nav-links li:nth-child(1), .nav-links li:nth-child(3) {
		width: 33%;
	}
	.nav-links li:nth-child(2) {
		width: 34%;
	}

	.link-about {
		background-color: #f2f339;
	}

	.link-offer {
		background-color: #79aefe;
	}

	.link-contact {
		background-color: #314190;
	}
  .img-right {
    float: none;              /* usuwa opływanie */
    display: block;           /* umożliwia wyśrodkowanie */
    margin: 0 auto 15px auto; /* wyśrodkowanie + margines dolny */
  }
}