<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Dynamic Greetings</title>
    <!-- Google Fonts -->
    <link
      href="https://fonts.googleapis.com/css2?family=Poppins&display=swap"
      rel="stylesheet"
    />
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="container">DEMO TEXT</div>
    <!-- Script -->
    <script src="script.js"></script>
  </body>
</html>
* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  background-color: #ae9cff;
}
.container {
  font-size: 1.3em;
  width: 25em;
  background: linear-gradient(-240deg, #8468ff 70%, #785bf7 70%);
  position: absolute;
  transform: translate(-50%, -50%);
  top: 50%;
  left: 50%;
  padding: 4.5em 1.3em;
  border-radius: 0.4em;
  box-shadow: 0 1.3em 1.8em rgba(94, 72, 181, 0.25);
}
.container h1 {
  font-family: "Poppins", sans-serif;
  text-align: center;
  color: #ffffff;
  text-transform: uppercase;
  font-weight: 400;
  letter-spacing: 0.1em;
  word-spacing: 0.4em;
}
let container = document.querySelector(".container");
let timeNow = new Date().getHours();
let greeting =
  timeNow >= 5 && timeNow < 12
    ? "Good Morning"
    : timeNow >= 12 && timeNow < 18
    ? "Good Afternoon"
    : "Good evening";
container.innerHTML = `<h1>${greeting}</h1>`;

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.