.nav-bar {
 display: flex;
 align-items: center;
 margin: 0 auto;
 width: 100%;
 justify-content: space-between;
 flex-wrap: wrap;
}
.nav-bar:before,.nav-bar:after {
 display: table;
 content: " ";
}
.nav-bar:after {
 clear: both;
}