.header{align-items:center;display:flex;height:auto;justify-content:center;padding:0;width:100%}.Left_Head{float:left;height:auto}.Right_Head{margin-left:auto}.header{padding:20px}@media only screen and (max-width:1280px){.header .Left_Head>a>img{width:200px}}@media only screen and (max-width:991px){.header .Left_Head>a>img{width:177px}}