body{margin:0;overflow:hidden;transition:background .8s ease}body.theme-coral{background:linear-gradient(135deg,#ffb7a2,#ff8a75)}body.theme-monochrome{background:radial-gradient(circle,#333,#111)}#theme-toggle{position:fixed;top:30px;right:30px;z-index:1000;background:transparent;border:1px solid rgba(255,255,255,.2);cursor:pointer;padding:10px;border-radius:50%;display:flex;transition:all .4s ease;color:#ffffff80}#theme-toggle:hover{color:#fff;border-color:#fffc;background:#ffffff0d}#canvas{display:block}