body {
    font-family: Times New Roman, sans-serif;
    font-size: 12px;
    background: #D1E9E9;
}

#container {
    width: 90%;
    padding: 40px;
    background: #D1E9E9;
    margin: 0 auto;
}

/* Header */
#header {
    margin: 0 auto;
    margin-bottom: 30px;
    font-size: 28px;
    text-align: center;
    color: #001F60;
}

/* Navigation */
nav {
    height: 50px;
    text-align: center;
    margin: 0;
    background: url(../pictures/tab_bottom.jpg) repeat-x bottom;
}

nav ul {
    display: inline-block;
    /*最左右单元与导航边的间距*/
    padding-left: 30px;
    padding-right: 30px;
}

nav ul li {
    float: left;
    list-style: none;
    /*导航栏各单元间距*/
    margin: 0 1.8em;
    font-size: 2.4em;
}

nav ul li a {
    text-decoration: none;

}


/*nav ul li a:visited {*/
/*    color: grey;*/
/*}*/

/*nav ul li a:active {*/
/*    border-bottom: 0px solid #fff;*/
/*    color: blue;*/
/*}*/

nav ul li a:hover {
    color: blue;
}



ul.introduction_style {
    font-size: 20px;
    list-style: none;
    line-height: 1.5em;
}

ul.interests_style {
    font-size: 20px;
    line-height: 1.8em;
    list-style-type: disc;
}

ul.talk_style {
    font-size: 20px;
    line-height: 1.8em;
    list-style-type: none;
}

h1.title_style {
    color: #FF5050;
    font-size: 1.8em;
    margin-top: 1em;
}

h2.title_style{
    color: #FF5050;
    font-size: 1.7em;
}

h2.course_title_style{
    color: blue;
    font-size: 1.7em;
}

h3.title_style{
    color: blue;
}

ul.paper_style {
    font-size: 20px;
    line-height: 2em;
    list-style-type: decimal;
}

ul.paper_style p,ul.interests_style p, ul.talk_style p {
    margin-top: 0;
    margin-bottom: 0;
}

.shadow_box {

    margin-top: 40px;
    margin-left: 24px;
    position: relative;
    display: inline-block;
    width: 1300px;
    height: auto;
    background-color: transparent;
    /*border: 0.5px dashed grey;*/
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    -webkit-transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);

}

.shadow_box::after {
    content: "";
    border-radius: 5px;
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    opacity: 0;
    -webkit-transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.shadow_box:hover {
    /*悬浮放大比例*/
    -webkit-transform: scale(1, 1);
    transform: scale(1, 1);
}

.shadow_box:hover::after {
    opacity: 1;
}