body#back {
    background-image: url(../image/204img.png);
    background-size:contain;
    background-repeat: repeat;
}
button {
    cursor:pointer;
 }
button.red {
    font-size: xx-large;
    background-color: red;
    height: 100px;
    color: white;
}
button.blue {
    font-size: xx-large;
    background-color: blue;
    height: 100px;
    color: wheat;
}
em.red,p.red,h1 {
    font-size: large;
    color: red;
}
button.yellow {
    background-color: yellow;
    color: black;
}
h1.big {
    font-size: xx-large;
    color: red;
}
a.blue {
    font-size: large;
    color: rgb(0, 0, 0);
    background-color: rgb(121, 121, 168);
}
button.other {
    font-size: xx-large;
    color: yellowgreen;
    background: linear-gradient(45deg,#f40303,#fcf700,#06f54e,#03d8f4,#4303f4,rgb(244, 3, 212),#eb0303);
}
button.othe {
    font-size: xx-large;
    color: yellowgreen;
    background: linear-gradient(90deg,#f40303,#fcf700,#03d8f4);
}button.oth {
    font-size: xx-large;
    color: yellowgreen;
    background: linear-gradient(-45deg,#f40303,#06f54e,#03d8f4);
}
title {
    text-align: center;
    }
    /* 改变标题颜色 */
    title {
    color: #FF0000;
    }
    /* 背景色与文本颜色 */
    title {
    background-color: #000;
    color: #FFF;
    }
    /* 添加边框且将标题放置在顶部 */
    title {
    border: 1px solid #000;
    padding: 10px;
    margin: 0;
    text-align: center;
    position: absolute;
    top: 0;
    width: 100%;
    }
    div.danzhao {
        border-width: thin;
        border-style:solid;
        border-color: #06f54e;
        width: 200px;
        height: 1000px;
        padding: 40px 40px 40px 0px;
        margin: 20px;
        text-align: left;
        color: #ffffff;
        background-color: #000;
        line-height: 1em;
        float:right;
    }
    li.red {
        color: #FF0000;
    }
    li.yellow,ol.yellow {
        color: gold;
    }
    .search {
        height: 25px;
        padding: 0px;
        margin: 0px;
        float: right;
    }
    
    .class203 {
        border-width: thin;
        border-style:solid;
        border-color: #f54a06;
        width: 200px;
        height: 900px;
        padding: 40px 40px 40px 0px;
        margin: 20px;
        text-align: left;
        color: #ffffff;
        background-color: #000;
        line-height: 30px;
        float:right;
    }
   .red1 {
    color: #FF0000;
   }
   .blue1 {
    color: #4303f4;
   }
   .yhao1 {
    color: #e4f403;
   }
   div.neirong {
    width: 800px;

   }
   span.lianjie {
    background-color: white;
   }