#page-head+*{margin-top: 100px;}是什么意思？

#page-head{

width: 100%;

height: 100px;

background: #f9f9f9;

position: fixed;

top: 0;

z-index: 99;

}

#page-head+*{margin-top: 100px;}

.navbar-default{

border: 0;

margin-bottom: 0;

}

#head-logo{

float: left;

margin-top: 15px;

}

.nav-tell{

float: right;

background: url(../images/index_08.png);

width: 186px;

height: 47px;

line-height: 47px;

font-size: 16px;

text-indent: 50px;

color: #ef200d;

margin-top: 27px;

}

.navbar-nav{

margin-left: 80px;

}

.navbar-nav li{

width: 98px;

height: 100px;

text-align: center;

font-size: 16px;

margin-left: 40px;

}

.navbar-nav li a{

padding: 0;

margin:0;

    line-height: 100px;

    color: #666;

}

.navbar-nav li.active > a{

background: url(../images/index_02.png);

}

@media screen and (max-width: 992px){

.navbar-nav{

margin-left: 0;

}

}

@media screen and (max-width: 768px){

.navbar-toggle{

margin-top:22px;

}

#head-logo{

margin-top: 8px;

}

#page-head{

height: 80px;

}

#page-head+*{margin-top: 80px;}

.navbar-nav{

margin-left: 0;

width: 100%;

}

.navbar-nav li{

width: 100%;

margin-left: 0;

height: 50px;

}

.navbar-nav li a{

line-height: 50px;

}

.navbar-collapse{

padding:0;

}

.full-padding{

padding: 0;

}

}