<h2>안녕하세요.</h2>
<p>환영합니다.</p>
<p id="date"></p>

@charset "utf-8";
html,body{
background-color:#fff;
color:#000;
}
h2
{
font-size:3rem;
color:#555;
font-weight:500;
}
@media (prefers-color-scheme:dark) {
html,body{
background-color:#000;
color:#fff;
}
}

var d = new Date();
document.getElementById("date").innerHTML = d;