body {
    font-size: 13px;
    width: 800px;
    margin: 20px auto;
}
.header .logo img {
    height: 80px;
}
.header .logo {
    float: left;
    padding-right: 30px;
}
.header {
    height: 80px;
    border-bottom: 1px solid #e2dede;
    padding-bottom: 10px;
}
.detail-tieude {
    text-align: center;
}