.headline{
    position: relative;
    width: 100%;
    line-height: 30px;
    margin: auto;
    text-align: center;
    overflow: hidden;
}

.left-nav{
    width: 16%;
    margin: 10px;
    /*overflow: auto;*/
    background-color: #1c232f;
    float: left;
}

.normal-div{
    width: 55%;
    overflow: auto;
    margin: 20px;
    border: white;
    float: left;
    background-color: gray;
}

.right-nav{
    position: fixed;
    top: 2%;
    margin-left: 90%;
    background-image: url("https://s1.ax1x.com/2023/01/21/pSGs7h4.jpg");
    background-size: 100% auto;
    background-repeat: no-repeat;
    padding: 1em 1em 1em 1em;
    font-size: 0.9em;
    text-align: center;
    line-height: 15px;
    width: 6%;
    height: 15%;
    background-color: black;
}

.right-content{
    background-color: rgba(255,255,255,0.4);
    margin: 4px;
}

.notice-div{
    float: right;
    margin: 10px;
    padding: 1em 1em 1em 1em;
    font-size: 1.2em;
    line-height: 25px;
    width: 16%;
    height: 45%;
    background-color: grey;
}

.normal-content{
    width: 90%;
    font-size: 1.5em;
    margin: 5px;
    background-color: rgba(0, 0, 0, 0);
    border-radius: 30px;
    padding-left: 1em;
    padding-right: 1em;
    padding-top: 0.5em;
}
.list-content{
    margin: 0;
    color: black;
    font-size: 1em;
    background-color: white;
    padding-left: 1.2em;
}

.python{
    background-image: url('https://s1.ax1x.com/2023/01/21/pSGr3Gj.jpg');
    background-size: 1em 1em;
    background-repeat: no-repeat;
    background-position: left;
}

.java{
    background-image: url("https://s1.ax1x.com/2023/01/21/pSGsVkF.jpg");
    background-size: 1em 1em;
    background-repeat: no-repeat;
    background-position: left;
}

.cpp{
    background-image: url("https://s1.ax1x.com/2023/01/21/pSGsulR.jpg");
    background-size: 1em 1em;
    background-repeat: no-repeat;
    background-position: left;
}

.bottom{
    width: 100%;
    height: 60px;
    overflow: auto;
    background-color: silver;
    border-bottom:1px solid #e0e0e0;
    border-top:1px solid #e0e0e0;
}

.top-image{
    width: auto;
    height: 80%;
}

.hidden{
    visibility: hidden;
}

table{
    border: 22px;
    width: 100%;
}

a{
    text-decoration: none;
}

/*body{*/
    /*background-image: url("https://s1.ax1x.com/2023/01/21/pSGgtVP.jpg");*/
/*}*/

span{
    /* 转化span模式，使span能设置宽高 */
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: #333;
    color: #fff;
    font-weight: 900;
    /* 使方块中文字居中 */
    text-align: center;
    line-height: 40px;
}

.weather{
    background-color: rgba(255,255,255,0.7);
}