html,body{
    width: 100%;
    height: 100%;
    background-color: #F7F7FC;
    box-sizing: border-box;
}
*{
    box-sizing: border-box;
    margin: 0;
    padding:0;
}
body{
    width: 100%;
    height: 100%;
}
.container{
    width: 100%;
    background-size: cover;
}
.header{
    height: 80px;
    line-height: 80px;
    text-align: center;
    color: #fff;
    font-size: 20px;
    background-color: #144E59;
    box-shadow: 0px 1px 5px 1px #001520;
    background: -moz-linear-gradient(left, #e5e5be 0, #003973 100%);
    background: -webkit-gradient(linear, left, right, color-sleft(0%, #e5e5be), color-sleft(100%, #003973));
    background: -webkit-linear-gradient(left, #e5e5be 0, #003973 100%);
    background: -o-linear-gradient(left, #e5e5be 0, #003973 100%);
    background: -ms-linear-gradient(left, #e5e5be 0, #003973 100%);
    background: linear-gradient(to left, #e5e5be 0, #003973 100%);
}
.header a{
    width: 40px;
    height: 40px;
    display: inline-block;
    position: absolute;
    right: 20px;
    top: 10px;
}
.header a img{
    width: 40px;
}
.main-demo{
    width: 1128px;
    margin: 20px auto 0;
}
.main-demo ul{
    list-style: none;
    float: left;
    width: 250px;
    margin:5px 16px;
}
.demo-item{
    margin-bottom: 15px;
    border:1px solid #ddd;
    padding: 15px;
    transition: all .5s;
    background-color: #fff;
}
.demo-item:hover{
    box-shadow: 1px 1px 6px 2px #ccc;
    transform: translate3d(0,-4px,0);
}
.demo-item a{
    display: block;
}
.demo-item a h2{
    color: #4d6dad;
    margin: 8px auto;
    font-weight: bold;
    font-size: 18px;
    word-wrap: break-word;
}
.demo-item a p{
    color: #333;
    margin: 8px auto;
    font-size: 14px;
    word-wrap: break-word;
}
.demo-item a img{
    width: 100%;
    display: block;
}
@media screen and (max-width: 1080px) {
    .container{
        height: 100%;
    }
    .header{
        font-size: 18px;
        width: 100%;
        height: 60px;
        line-height: 60px;
    }
    .header a{
        width: 40px;
        height: 40px;
        display: inline-block;
        position: absolute;
        right: 8px;
        top: 10px;
    }
    .main-demo{
        width: 100%;
        margin: 10px auto;
    }
    .main-demo ul{
        list-style: none;
        float: left;
        width: 22%;
        margin:1.5%;
    }
    .demo-item{
        margin-bottom: 10px;
        border:1px solid #ddd;
        padding: 4px;
        transition: all .5s;
        background-color: #fff;
    }
    .demo-item:hover{
        box-shadow: 1px 1px 6px 2px #ccc;
        transform: translate3d(0,-4px,0);
    }
    .demo-item a{
        display: block;
    }
    .demo-item a h2{
        color: #4d6dad;
        margin: 8px auto;
        font-weight: bold;
        font-size: 12px;
        word-wrap: break-word;
    }
    .demo-item a p{
        color: #333;
        font-size: 10px;
        word-wrap: break-word;
        display: none;
    }
    .demo-item a img{
        width: 100%;
        display: block;
    }

}