The answer below includes changing text for "show/hide", and uses a single checkbox, two labels, a total of four lines of html and five lines of css. It also starts out with the content hidden.
HTML
<input id="display-toggle" type=checkbox>
<label id="display-button" for="display-toggle"><span>Display Content</span></label>
<label id="hide-button" for="display-toggle"><span>Hide Content</span></label>
<div id="hidden-content"><br />Hidden Content</div>
CSS
label {
background-color: #ccc;
color: brown;
padding: 15px;
text-decoration: none;
font-size: 16px;
border: 2px solid brown;
border-radius: 5px;
display: block;
width: 200px;
text-align: center;
}
input,
label#hide-button,
#hidden-content {
display: none;
}
input#display-toggle:checked ~ label#display-button {
display: none;
}
input#display-toggle:checked ~ label#hide-button {
display: block;
background-color: #aaa;
color: #333
}
input#display-toggle:checked ~ #hidden-content {
display: block;
}