* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

/* 头部样式 */
.header {
    background-color: #f1f1f1;
    padding: 20px;
    text-align: center;
}

/* 导航条 */
.topnav {
    overflow: hidden;
    background-color: #333;
}

/* 导航链接 */
.toplink {
    float: left;
    display: block;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    color: #f2f2f2;

}

.topnav a.active {
    color: black;
    background-color: #ddd;
}

/* 链接 - 修改颜色 */
.topnav a:hover {
    background-color: #ddd;
    color: black;
}
#login_form{
    width: 50%;
    margin-left: 25%;
}
.login {
    width: 100%;
    padding: 12px 20px;
    margin: 8px 0;
    box-sizing: border-box;
}

.leftbox {
    width: 25%;
    height: 100%;
    float: left;
}

.rightbox {
    width: 75%;
    height: 100%;
    float: right;
}

.topic a {
    width: 100%;
    display: inline-block;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    color: #333333;
}

.topic:hover {
    background-color: lightgrey;
}

.topic a.active {
    background-color: dimgray;
    color: white;
}

.topic {
    background-color: #dddddd;
    list-style: none;
    border-bottom: 1px solid gray;
}

#topics {
    margin: 0;
    padding: 0;
}


ul.pagination {
    display: inline-block;
    padding: 0;
    margin: 0;
}

ul.pagination li {
    display: inline;
}

ul.pagination li a {
    color: black;
    float: left;
    padding: 8px 16px;
    text-decoration: none;
    transition: background-color .3s;
    border: 1px solid #ddd;
}

ul.pagination li a.active {
    background-color: #4CAF50;
    color: white;
    border: 1px solid #4CAF50;
}

ul.pagination li a:hover:not(.active) {
    background-color: #ddd;
}

.page {
    text-align: center;
    margin-top: 10px;
}
div.center {
    text-align: center;
    margin-top: 10px;
}
/*#customers {*/
/*    font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;*/
/*    width: 100%;*/
/*    border-collapse: collapse;*/
/*}*/

/*#customers td, #customers th {*/
/*    font-size: 1em;*/
/*    border: 1px solid #98bf21;*/
/*    padding: 3px 7px 2px 7px;*/
/*}*/

/*#customers th {*/
/*    font-size: 1.1em;*/
/*    text-align: left;*/
/*    padding-top: 5px;*/
/*    padding-bottom: 4px;*/
/*    background-color: #A7C942;*/
/*    color: #ffffff;*/
/*}*/

#customers {
    margin: 0;
}
table {
    /*table-layout: fixed;*/
    width: 100%;
    border-collapse: collapse;
    border: 2px solid lightgray;
}


th, td {
    /*padding: 5px;*/
    text-align: center;
    border: 1px solid grey;
    word-break: break-all;
    word-wrap: break-word;
}

.table_box {
    /*height: 450px;*/
    padding: 0;
}
.wrapper{
    width: 100%;
    clear: both;
}
.table_header {
    /*font-size: 20px;*/
    background-color: dimgrey;
    /*text-align: center;*/
    width: 20%;
    border: 1px solid black;
    /*margin-top: 100px;*/
    padding: 10px;
}
.table_header:hover{
    background-color: #f1f1f1;
}
 .table_container {
     /*display: none;*/
 }
 button:hover {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);
}