Some problem in run time

[coderstar1234]

<
!DOCTYPE html>

<title>Document</title> <iframe src="https://prashanthkumar0.github.io/kitten-cannon-remake/"></iframe> body { background: #000; margin: 0px; overflow: hidden; }

iframe {
position: fixed;
top:0px;
left:0px;
display: block;
border: none;
width: 100vw;
height: 100vh;
z-index: 0;
}

.gh-badge {
display: inline-block;
position: fixed;
top: -12px;
right: -76px;
background: #000;
box-shadow: 0px 0px 10px #444;
/* border: 1px solid #EEE; */
width: 200px;
height: 80px;
transform-origin: 50% 50%;
transform: rotate(45deg);
z-index: 100;
}

.gh-icon {
position: relative;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
width: 50px;
fill: #EEE;
}
alert("IMPORTANT INFO! \n\n\nSend your highscore with screenshot to get featured in comment :) \n\n\nHave Fun! .");