.box {
    width: 480px;
    height: 850px;
    border: 3px solid green;
    /* 已知宽高的盒子在浏览器中居中
        margin:0 auto(自适应);
    */
    margin: 0 auto;
}
.main {
    width: 443px;
    height: 816px;
    margin: 17px;
}

.head {
    /* 
        继承父级宽高为100%
    */
    width: 100%;
    height: 35px;
    background: #ccc;
    line-height: 35px;
}
.head span:first-child {
    font-weight: 800;
}
.head span:last-child {
    color: rgb(0, 140, 255);
    /* 浏览器默认字体16px */
    font-size: 14px;
    padding-left: 10px;
}

.list .title {
    font-weight: bold;
    color: orange;
    margin-bottom: 0;
}

.list .title>span {
    color: rgb(0, 140, 255);
}

.list .word {
    color: #ccc;
    font-size: 15px;
    text-indent: 2em;
    margin-top: 5px;
}
.list ul li a{
    text-decoration: none;
    color: #000;
    font-size: 16px;
}
.list ul li a span {
    color: rgb(0, 140, 255);
}

.advertising {
    width: 100%;
    height: 95px;
}
.advertising img {
    width: 100%;
    height: 100%;
}