body {
    font-family: 'Microsoft YaHei', sans-serif;
}

.mai-icon {
    background: #38f;
    color: #fff;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    margin-right: 20px;
}


.head {
    position: absolute;
    top: 0;
    width: 100%;
    height: 70px;
    background-color: #ffffff;
  }
  
  nav {
    position: absolute;
    position: sticky;
    z-index: 100011111;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    align-items: center;
    /* justify-content: flex-end;*/
    /* 左右padding */
    padding: 0 15vw;
    height: 60px;
    background-color: rgba(67, 67, 67, 0.7);
    /* box-shadow: 0 0 10px rgba(254, 253, 253, 0.5);*/
  }
  
  
  #first {
    position: absolute;
    left: 26px;
    font-family: '华文行楷';
    font-weight: 900;
    font-size: 25px;
  }
  
  #jiaoshe {
    margin-top: 100px !important;
  }
  
  .nav-menu {
    /* 占令一半宽度 */
    flex: 1;
    display: flex;
    justify-content: space-around;
  
    /* 最宽550px 
    max-width: 550px;*/
  }
  
  .nav-menu li {
    width: 40%;
    list-style: none;
    color: #dadbdd;
    font-weight: 600;
font-size:15px;
    text-align: center;
  }
  
  .nav-menu li a {
    color: rgba(255, 255, 255, 0.8);
  }

.banner {
    text-align: center;
    color: #fff;
    background: url(../img/12.jpg);
}

.lvjing {
    width: 100%;
    height: 100%;
    background:rgb(44 99 169);
    padding-top: 30px;
}
/*bbs*/
#bbs {
    padding: 80px 0;
    text-align: center;

}

#bbs .col-md-4 {
    padding: 15px;
color: rgb(255,255,255);
}

#bbs .col-md-4:hover {/*
    background: #f1f1f1;
    box-shadow: 1px 1px 4px #ccc;*/
}

#bbs a {
    color: rgb(255,255,255);
    text-decoration: none;
}

#bbs img {
    margin: 0 auto;
}

/*HTML5 + bootstrap*/
#html5 {
    background: #f8f8f8;
}

#html5,
#bootstrap {
    padding: 80px 0;
}

#html5 h2,
#bootstrap h2 {
    font-weight: bold;
}

#html5 p,
#bootstrap p {
    line-height: 25px;
}

/*course*/
#course {
    background: #f8f8f8;
    padding: 80px 0;
    text-align: center;
}

#course h2 {
    font-weight: bold;
    padding-bottom: 60px;
}

#course .col-md-3 {
        text-align: center;
        color: #fff;
        background: url(../img/11.jpg);
        background-size: 100% 100%;
}

.course {
    background: #ffffff;
    border: 1px solid #eee;
}

#course .btn {
    background: transparent;
    border: 1px solid #38f;
    border-radius: 0px;
    color: #38f;
    margin-top: 20px;
    margin-bottom: 30px;
    padding: 8px 40px;
    transition: all 0.3s;
}

#course .btn:hover {
    background: #38f;
    color: #fff;
}

.course .case-img {
    width: 100%;
    height: 300px;
}

/*app*/
#app {
    padding: 80px 0;
}

#app h2 {
    font-weight: bold;
    padding-bottom: 30px;
}

#app .btn {
    margin: 10px 0;
    background: rgb(64, 210, 177);
    border-color: rgb(64, 210, 177);
    border-radius: 0;
    padding: 6px 30px;
    transition: all 0.3s;
}

#app .btn:hover {
    background: rgb(44, 142, 120);
}

/*contact*/
#contact {
    background: url("") no-repeat;
    background-size: cover;
    color: #ffffff;
}

#contact h2 {
    font-weight: bold;
    margin-top: 0;
    margin-bottom: 25px;
}

#contact p {
    line-height: 24px;
    margin-bottom: 2px;
}

#contact .form-control {
    border: none;
    border-radius: 0;
    height: 50px;
    margin-bottom: 20px;
}

#contact textarea.form-control {
    height: auto;
}

#contact input[type="submit"] {
    background: #40D2B1;
    color: #fff;
    font-weight: bold;
    transition: all 0.3s;
}

#contact input[type="submit"]:hover {
    background: rgb(44, 142, 120);
}
#contact col-md-5  {
    transform: translateY(-500px);
}
/*footer*/
footer {
    font-weight: 400;
    text-align: center;
    padding: 20px;
    color: #999;
}
td,th{
    text-align: center;
}
td{
    display: table-cell;
    vertical-align: inherit;
}
table,.tablepress{
    border-collapse: collapse;
    width: 1000px;
    margin-bottom: 1rem;
    font-weight: 300;
}

#home{
    text-align: center;
}

.home img{
    text-align: center;
}

/*bba*/
#bba {
    padding: 80px 0;
    text-align: center;
}


#bba a {
    color: #212121;
    text-decoration: none;
}

#bba img {
    margin: 0 auto;
}

.contain{
    /* 相对定位 */
    position: relative;
    /* 背景颜色· */
    background: #aad5f6;
}

.slide-1{
    background: url('../img/golden-lights.jpg');
}
.slide-2{
    background: url('../img/13.jpg');
}

.slide{
    width: 100%;
    height: 100vh;
    /* 图像铺满整个背景区域, */
    background-size: cover;
    background-position: center;
    /* 相对定位 */
    position: relative;
    overflow-x: hidden ;
}

.caption{
    background:rgba(0, 0, 0, 0.03) ;
    width: 100%;
    /* 绝对定位 */
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    padding: 40px 0px;
}

.contain h3{
    color: #fff;
    text-align: center;
    font-size: 50px;
    padding: 18px;
}

.contain p{
    max-width: 600px;
    width: 90%;
    margin: 0 auto;
    color: #ccc;
    text-align: center;
    font-size: 18px;
    line-height: 1.5em;
}

.arrow {
    /* 绝对定位 */
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    z-index: 100;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
    transform: background 500ms;
}

.arrow img{
    width: 50px;
}

.arrow:hover{
    background:rgba(0, 0, 0, 0.4) ;
}

.l{
    left: 0;
}
.r{
    right: 0;
}