body{color:#fff;background-color:#000;margin:0;padding:0;font-family:Arial,sans-serif}html,body{height:100%;min-height:calc(var(--vh,1vh)*100);margin:0;padding:0;overflow-x:hidden}body{touch-action:manipulation;flex-direction:column;display:flex}.logo{width:200px;margin:20px auto;display:block}@media only screen and (orientation:landscape) and (max-width:800px){.logo{width:100px;margin:10px auto}}