.main{
    max-width: 640px;
    margin: 10px auto;
    padding: 0 10px;
}

.menu{
    text-align: center;
}
.menu p{
    line-height: 50px;
    font-size: 20px;
    font-weight: bold;
}

.artper{
    text-align: left;
    padding: 10px 0;
    border-bottom: 1px dashed #ececec;
}
.artper p{
    line-height: 25px;
    font-size: 16px;
}

.page{
    text-align: center;
    padding-top: 20px;
    padding-bottom: 20px;
}


/*art*/
.topmenu{
    width: 100%;
    height: 40px;
    text-align: center;
    background-color: cornflowerblue;
    position: fixed;
    top: 0;
}
.topmenu p a{
    line-height: 40px;
    font-size: 16px;
    font-weight: bold;
}
.topdi{
    height: 45px;
    width: 100%;
}
.title{
    text-align: left;
    font-size: 16px;
}
.title p{
    line-height: 25px;
}
.author{
    height: 35px;
}
.author p{
    line-height: 35px;
    font-size: 14px;
}
.date{
    font-size: 12px;
    color: #999;
}
.content{
    text-align: left;
    text-indent: 28px;
}
.content p{
    line-height: 30px;
    font-size: 14px;
}

button{
    width: 100px;
    height: 25px;
    margin: 5px 0 0 0;
    text-align: center;
    line-height: 25px;
    background-color: blue;
    border-radius: 5px;
    color: #eee;
}