What @kathryn was saying is to use the “button” HTML. This is an example that you can use as a guide. The styling would be the default styling of the button element for the theme, or if the theme doesn’t have styling for that element, then what the browser decides.
<button>Click Me!</button>
If you wish to add your own styling to that button, then you would need to add a CSS class or an id to that code, such as this.
<button type="my-button">Click Me!</button>
The above would be placed into the page or post content and then you would have to create a CSS rule to style it as you see fit, such as the below example.
.my-button {
background-color: #cc0000;
color: #000;
border: 1px solid #000;
border-radius: 5px;
padding: 20px;
}