header {
  padding: 500px 0 500px;
}

@media (min-width: 992px) {
  header {
    padding: 150px 500px 150px 0px;
  }
}

section {
  padding: 150px 0;
}


.font_bk{
  border:2px solid #a1a1a1;
  border-radius:10px;
  padding:3px 5px 4px 4px; 
}

.blog-bg {
  background: #2b2b2b;
  padding-right: 0px;
  padding-left: 0px;
}

.blog-bg h4 {
  color: #dadada;
  padding-top: 0px;
}

.blog-bg h5 {
  color: #dadada;
  font-size: 11px;
}

.blog-content {
  padding-top: 10px;
  background: #f2f2f2;
}
.centered {
  text-align: center;
}
.row {
  margin-right: 0px;
  margin-left: -15px;
}

.bg-primary1{
  background-color: transparent;
}
.navbar-brand1{
  display: inline-block;
  padding-top: .3125rem;
  padding-bottom: .3125rem;
  margin-right: 1rem;
  font-size: 1.25rem;
  line-height: inherit;
  white-space: nowrap;
}

/* ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: transparent;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover {
  background-color: transparent;
} */


#headerwrap {
  /* background: url(../img/7.png) no-repeat center top; */

  background: linear-gradient(to right, grey , black); /* 标准的语法（必须放在最后） */
  margin-top: -50px;
  padding-top: 120px;
  text-align: center;
  background-attachment: relative;
  background-position: center center;
  min-height: 550px;
  width: 100%;
  -webkit-background-size: 100%;
  -moz-background-size: 100%;
  -o-background-size: 100%;
  background-size: 100%;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}