<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Account Activation</title>
    <style>
      body {
        font-family: Arial, sans-serif;
        margin: 0;
        padding: 0;
        background-color: #f4f4f4;
      }
      .email-container {
        max-width: 600px;
        margin: 20px auto;
        background-color: #ffffff;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 