<nav class="navbar navbar-default">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand">Live With It</a>
</div>
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Portfolio</a></li>
<li><a href="#">Contact</a></li>
</ul>
</div>
</div>
</nav>

@media (min-width: 768px) {
.navbar-header {
float: left;
}
}
.navbar-brand {
float: left;
}
@media (min-width: 768px) {
.navbar-nav {
float: left;
}
.navbar-nav > li {
float: left;
}
}

@media (min-width: 768px) {
.navbar-toggle {
display: none;
}
}
.collapse {
display: none;
}
@media (min-width: 768px) {
.navbar-collapse.collapse {
display: block !important;
height: auto !important;
overflow: visible !important;
}
}

.navbar {
position: relative;
min-height: 50px;
margin-bottom: 20px;
border: 1px solid transparent;
}
@media (min-width: 768px) {
.navbar {
border-radius: 4px;
}
}

@media (min-width: 768px) {
.navbar-header {
float: left;
}
}
.container > .navbar-header,
.container-fluid > .navbar-header {
margin-right: -15px; //小屏幕的时候header内容左边缘和container左边缘对齐
margin-left: -15px;
}
@media (min-width: 768px) {
.container > .navbar-header,
.container-fluid > .navbar-header {
margin-right: 0; 
margin-left: 0;
}
}

.navbar-brand {
float: left;
height: 50px;
padding: 15px 15px;
font-size: 18px;
line-height: 20px;
}
.navbar-brand:hover,
.navbar-brand:focus {
text-decoration: none;
}
.navbar-brand > img {
display: block;
}
@media (min-width: 768px) {
.navbar > .container .navbar-brand,
.navbar > .container-fluid .navbar-brand {
margin-left: -15px; /*大屏幕的时候内容左边缘和header左边缘对齐*/
}
}

.nav {
padding-left: 0;
margin-bottom: 0;
list-style: none;
}
.nav > li {
position: relative;
display: block;
}
.nav > li > a {
position: relative;
display: block;
padding: 10px 15px;
}
.nav > li > a:hover,
.nav > li > a:focus {
text-decoration: none;
background-color: #eee;
}

.navbar-nav {
margin: 7.5px -15px; /*折叠之后添加一个上下边距，每一行都和屏幕等宽*/
}
.navbar-nav > li > a {
padding-top: 10px;
padding-bottom: 10px;
line-height: 20px;
}
@media (min-width: 768px) {
.navbar-nav {
float: left;
margin: 0;
}
.navbar-nav > li {
float: left;
}
.navbar-nav > li > a {
padding-top: 15px;
padding-bottom: 15px;
}
}

@media (min-width: 768px) {
.navbar-left {
float: left !important;
}
.navbar-right {
float: right !important;
margin-right: -15px; //第一个添加navbar-right的元素右边会有一个负边距
}
.navbar-right ~ .navbar-right { //之后的都不会有
margin-right: 0;
}
}

.navbar-toggle {
position: relative;
float: right;
padding: 9px 10px;
margin-top: 8px;
margin-right: 15px;
margin-bottom: 8px;
background-color: transparent;
background-image: none;
border: 1px solid transparent;
border-radius: 4px;
}
.navbar-toggle:focus {
outline: 0;
}
@media (min-width: 768px) {
.navbar-toggle {
display: none;
}
}
.navbar-toggle .icon-bar {
display: block;
width: 22px;
height: 2px;
border-radius: 1px;
}
.navbar-toggle .icon-bar + .icon-bar {
margin-top: 4px;
}

.collapse {
display: none;
}
@media (min-width: 768px) {
.navbar-collapse.collapse {
display: block !important;
height: auto !important;
padding-bottom: 0;
overflow: visible !important;
}
}

.navbar-collapse {
padding-right: 15px;
padding-left: 15px;
overflow-x: visible;
-webkit-overflow-scrolling: touch;
border-top: 1px solid transparent;
-webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
box-shadow: inset 0 1px 0 rgba(255, 255, 255, .1);
}
.container > .navbar-collapse,
.container-fluid > .navbar-collapse {
margin-right: -15px;
margin-left: -15px;
}
@media (min-width: 768px) {
.navbar-collapse {
width: auto; 
border-top: 0;
-webkit-box-shadow: none;
box-shadow: none;
}
}
@media (min-width: 768px) {
.container > .navbar-collapse,
.container-fluid > .navbar-collapse {
margin-right: 0;
margin-left: 0;
}
}

.navbar-nav {
text-align:center;
}
.nav li {
display:inline-block;
}
.navbar {
border: 0;
}
.navbar .navbar-header {
padding-top:10px;
padding-bottom:10px;
}
@media(min-width:768px){
.navbar-collapse {
padding-top:10px;
padding-bottom:10px;
}
}
.navbar-brand {
font-size: 34px;
font-family: Lobster, Monospace;
}
.nav {
font-size: 20px;
}
@media(max-width:768px){
.container .navbar-collapse {
margin-left: 12px;
margin-right: 12px;
}
}

@media(min-width:768px){
.navbar {
background-color: #F79C9C;
}
}
.navbar-girl .navbar-header,
.navbar-girl .navbar-collapse {
background-color: #F79C9C;
}
.navbar-girl .navbar-brand {
color: #FFF;
}
.navbar-girl .navbar-text {
color: #F7846B;
}
.navbar-girl .navbar-nav > li > a {
color: #F7846B;
}
.navbar-girl .navbar-nav > li > a:hover,
.navbar-girl .navbar-nav > li > a:focus {
color: #CEE6E6;
background-color: transparent;
}
.navbar-girl .navbar-nav > .active > a,
.navbar-girl .navbar-nav > .active > a:hover,
.navbar-girl .navbar-nav > .active > a:focus {
color: #F7846B;
background-color: #FFF;
}
.navbar-girl .navbar-toggle {
border-color: #FFF;
}
.navbar-girl .navbar-toggle:hover,
.navbar-girl .navbar-toggle:focus {
background-color: #CEE6E6;
}
.navbar-girl .navbar-toggle .icon-bar {
background-color: #FFF;
}
.navbar-girl .navbar-collapse {
border-color: #FFF;
}