Their current email has the margins set wrong, meaning there's too little space between elements.

<html>
<head>
  <style>body {
text-align: center;
}

button {
font-size: 18px;
background-color: purple;
color: white;
border-radius: 30px;
margin: 0px 0 0 0;
}

h2 {
margin: 0;
}

p {
margin: 0;
}img {
  border-radius: 10px;
}
</style>
</head>
<body>
<h2>Challenges - Coding Brain Teasers</h2>
<img src="https://getmimo.com/r/maze.png">
<p>Mimo Challenges are code-based brain teasers designed to improve your programming skills and sharpen your problem-solving abilities.</p>
<button>OPEN THE APP</button>
<p>Stay tuned! More fresh skills on learning how to code will be coming your way next week.</p>
</body>
</html>]]>