What margins does the heading element have?

<html><head><style>body {text-align: center;
}
button {
font-size: 18px;
background-color: purple;
color: white;
border-radius: 30px;
margin: 0px 0 0 0;
}
h3 {
margin: 50px 0 50px 0;
background-color: Plum;
}
img {
  border-radius:10px;height: 100px;width: 100px;
}
</style>
</head><body><h3>Paris</h3>
<img src="https://getmimo.com/r/eiffel.png">
<h3>London</h3>
<img src="https://getmimo.com/r/londoneye.png">

</body>
</html>]]>
Top and bottom marginsA bottom marginA right marginA left margin

Top and bottom margins.