body {
    width: 960px;
    height: 862px;
    margin: 0px;
}

#title {
    height: 70px;
    background-color: rgb(48, 44, 44);
    width: 100%;
    color: #fff;
    position: relative;
}

#title p {
    position: absolute;
    top: 3.7px;
    left: 130px;
    font-size: 19px;
}

#title ul {
    position: absolute;
    top: -13px;
    right: 50px;
}

#title ul li {
    display: inline-block;
    margin-right: 15px;
}

#title a:visited {
    color: #fff;
}

#guide {
    width: 100%;
    height: 120px;
    background-color: rgba(76, 212, 83, 0.692);
    position: relative;
    margin-top: 0px;
    border: cadetblue 1px solid;
}

#guide a {
    text-decoration: none;
}

#guide ul {
    list-style-type: none;
    position: absolute;
    bottom: -8px;
    right: 60px;
}

#guide ul li {
    display: inline-block;
    width: 25px;
    height: 35px;
    margin-right: 0px;
    transition: 0.5s all;
    background-color: rgb(245, 240, 222);
    text-align: center;
    line-height: 35px;
    font-family: Arial, Helvetica, sans-serif;
}

#guide ul li:hover,
:active {
    height: 45px;
}

#container {
    width: 960px;
    border: 1px solid gray;
    height: 580px;
    margin-bottom: -16px;
}

#guide1 {
    width: 100%;
    height: 60px;
    top: 0px;
    left: 0px;
    border: 1px solid rgb(192, 187, 187);
    position: relative;
    border-top: 0px;
}

.guide3 {
    list-style-type: none;
    position: absolute;
    left: 90px;
    top: 4px;
}

.guide3 li {
    display: inline;
    background-color: rgb(202, 202, 202);
    text-align: center;
    line-height: 39px;
    /*垂直水平居中*/
    font-size: 13px;
    margin-left: -4.5px;
}

.guide3 li a {
    display: inline-block;
    width: 100px;
    height: 40px;
    background-color: rgb(229, 226, 226);
    border: rgb(192, 187, 187) 1px solid;
    border-top-left-radius: 9px;
    border-top-right-radius: 9px;
    border-bottom: 0px;
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
}

.guide3 li a:focus,
li a:hover {
    background-color: white;
}


/*a的focu可以保持*/

.guide3 li a:visited {
    color: black;
}

#foot {
    width: 100%;
    height: 90px;
    background-color: rgb(48, 44, 44);
    color: #ffffff;
    padding: 0px;
    text-align: center;
}


/*中间三列 圣杯布局*/

#content {
    background-color: white;
    width: 100%;
    height: 522px;
    float: left;
}

#left {
    background-color: white;
    height: 522px;
    width: 124.8px;
    float: left;
    margin-left: -100%;
    /*利用负边距 在浮动的情况下布局 ——圣杯式*/
    position: relative;
    left: -124.8px;
}

#right {
    background-color: white;
    height: 522px;
    width: 124.8px;
    float: left;
    margin-left: -124.8px;
    /*利用负边距 在浮动的情况下布局 ——圣杯式*/
    position: relative;
    right: -124.8px;
}


/*父类创建左右内边距，使*/

#container2 {
    padding: 0px 124.8px;
}

section {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    margin-top: 10px;
}

article {
    padding: 10px;
    margin: 4px;
    height: 123px;
}

article p {
    text-align: center;
    line-height: 80px;
}

#a1 article {
    flex: 1 100px;
    border: 1px solid grey;
}

#a1 article:nth-of-type(3) {
    flex: 0.75 100px;
}

#a2 article {
    flex: 100px;
    border: 1px solid grey;
}

#a3 article {
    flex: 150px;
    border: 1px solid grey;
}