.header{margin-top:18vh;margin-bottom:5vh;text-align:center}.header .my_logo{width:220px;height:70px;line-height:70px;font-size:40px;text-align:center;margin:0 auto;color:#4e9ff5}.header .description{font-size:17px;text-align:center;color:rgba(0,0,0,.7);margin-top:5vh}