/* 覆盖bootstrap初始样式
-------------------------- */
.h1,.h2,.h3,.h4,.h5,.h6,h1,h2,h3,h4,h5,h6 {
  line-height: 1.5;
}


/* 顶部导航
-------------------------- */
  .nav {
    background-color: #000;
  }
  .nav .navbar {
    width: 1140px;
    padding: 10px 15px; 
    margin: 0 auto;
  }
  .navbar-brand {
    padding-top: 0;
    padding-bottom: 0;
    margin-right: 0;
    height: 40px;
    opacity: .9;
    transition: 0.5s;
  }
  .navbar-brand:focus, .navbar-brand:hover {
    opacity: 1;
  }
  .navbar-brand-logo {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: url('../images/brand.png') center center no-repeat;
    background-size: auto 100%;
  }
  .navbar-dark .navbar-nav .nav-link {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 40px;
    padding: 5px 25px;
    color: rgba(255, 255, 255, .8);
    transition: 0.5s;
  }
  .navbar-dark .navbar-nav .nav-link:focus,
  .navbar-dark .navbar-nav .nav-link:hover {
    color: rgba(255, 255, 255, 1);
  }
  .navbar-dark .navbar-toggler {
    border-color: rgba(255, 255, 255, 0); 
  }














@media( max-width: 1200px ) {
/* 顶部导航
-------------------------- */
  .nav .navbar {
    width: 100%;
    margin: 0 0;
  }
}