.desc {width: 100%; display: flex;}
.desc_img {width: 172px; height: 96px; margin-right: 18px; border-radius: 5px}
.desc_text {flex: 1;font-size: 15px; line-height: 1.6; color: #444;}
#mainContent {width: 100%}
#sideBar: {display: none;}
body: {background: red;}
#header: {background: red;}
#navigator: {background-color: red;}