tailscale/cmd/tailscale/cli/auth-redirect.html

<html>
<head>
	<title>Redirecting...</title>
	<style>
		html,
		body {
			height: 100%;
		}

		html {
			background-color: rgb(249, 247, 246);
			font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
			line-height: 1.5;
			-webkit-text-size-adjust: 100%;
			-webkit-font-smoothing: antialiased;
			-moz-osx-font-smoothing: grayscale;
		}

		body {
			display: flex;
			flex-direction: column;
			align-items: center;
			justify-content: center;
		}

		.spinner {
			margin-bottom: 2rem;
			border: 4px rgba(112, 110, 109, 0.5) solid;
			border-left-color: transparent;
			border-radius: 9999px;
			width: 4rem;
			height: 4rem;
			-webkit-animation: spin 700ms linear infinite;
      animation: spin 800ms linear infinite;
		}

		.label {
			color: rgb(112, 110, 109);
			padding-left: 0.4rem;
		}

		@-webkit-keyframes spin {
			to {
				transform: rotate(360deg);
			}
		}

		@keyframes spin {
			to {
				transform: rotate(360deg);
			}
		}
	</style>
</head> <body>
	<div class="spinner"></div>
	<div class="label">Redirecting...</div>
</body>