h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    font-weight: bold;
}

nav.navbar {
  transition: 0.5s;
}

nav.navbar.navbar-default.navbar-fixed-top.navbar-top, 
nav.navbar .dropdown,
nav.navbar .dropdown a,
nav.navbar .dropdown .dropdown-menu,
nav.navbar .dropdown .dropdown-menu a {
  background-color: transparent!important;
}

nav.navbar .dropdown.open>a {
    background-color: rgba(0, 0, 0, 0.6)!important;
}

nav.navbar.navbar-default.navbar-fixed-top.navbar-top a {
  color: white;
  transition: 0.5s;
}

nav.navbar.navbar-default.navbar-fixed-top.navbar-top a:hover {
  color: #ff6e3a;
}

header.jumbotron::before {
    background-image: url(../../images/introduction/introduction.jpg);
    background-size: cover;
    background-attachment: fixed;
    content: "";
    display: block;
    width: 100%;
    height: 600px;
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background-position: center center;
    filter: brightness(0.4);
}

header.jumbotron {
  background-color: transparent;
  text-align: center;
  margin-bottom: 0px;
}

header.jumbotron .container {
  color: white;
  padding: 150px 0px;
}

section {
  padding: 30px 0px;
  text-align: center;
}

section .section-heading {
  margin-bottom: 50px;
  font-size: 50px;
}

section#section_intro .col-sm-12{
    color: #B08115;
}

@media screen and (max-width: 768px){
    section#section_intro h1{
        margin-top: 120px;
    }
}

section#section_intro .col-sm-6{
    padding-right: 20px;
    padding-bottom: 30px;
}

section#section_intro .content-wrap{
    border: solid 2px #F5B52C;
    border-radius: 10px;
    padding: 20px;
    height: 250px;
}

@media screen and (max-width: 768px){
    section#section_intro .content-wrap{
        height: 300px;
    }
}

section#section_intro .icon{
    font-size: 50px;
    color: #B08115;
}

section#section_intro ul{
    text-align: left;
    margin-left: 130px;
    list-style: none;
    font-size: 20px;
}

@media screen and (max-width: 768px){
    section#section_intro ul{
        margin-left: 40px;
    }
}

section#section_intro ul li::before {
  content: "● "; /* 自定义图标，也可以使用字体图标 如：content: "\f105"; font-family: FontAwesome;*/
  color: #F5B52C; /* 自定义颜色 */
}

section#section_picture{
    background-color: #F5B52C;
}

section#section_picture hr{
    max-width: 120px;
    border: solid 2px #755207;
}

section#section_picture .col-sm-6{
    margin: 20px 0px; 
}

section#section_picture .img_wrap {
    height: 300px;
    overflow: hidden;
}

section#section_picture img {
    width: 550px;
}

@media screen and (max-width: 768px){
    section#section_picture img{
        width: 350px;
    }
}