.header{overflow:hidden;background-color:#f1f1f1;padding:10px 10px}.header a{float:left;color:black;text-align:center;padding:15px;text-decoration:none;font-size:16px;line-height:20px;border-radius:4px}.header a.logo{font-size:25px;font-weight:bold}.header a:hover{background-color:#19ceeb;color:black}.header a.active{background-color:dodgerblue;color:white}.header-right{float:right}