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<title>Super Mario Blocks in CSS</title>
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<h1 id="super-mario-blocks-in-css">Super Mario Blocks in CSS</h1>
<p>2019-02-15</p>
<p>Just because we can, let’s make a quick demo on how to build interactive elements based off the original Mario punch blocks.</p>
<p>What our final product will look like:</p>
<p><img src="/public/images/mario-block.png" alt="Mario blocks cretaed with CSS" /></p>
<p><a href="https://codepen.io/bradleytaunt/pen/JjEPOVe">Live CodePen Example</a></p>
<h2 id="the-html">The HTML</h2>
<p>The set of Mario blocks doesn’t require a huge amount of effort for it’s <code>html</code> structure, we only need:</p>
<ul>
<li>Parent div for each block</li>
<li>Checkbox input</li>
<li>Checkbox label</li>
<li>Inner label divs to represent the block “dots”</li>
</ul>
<p><strong>Sidenote</strong>: This is only how <em>I</em> chose to add the inner dots to the Mario blocks. There are many other ways to create these, so please feel free to implement them however you see fit.</p>
<pre><code><!-- Main parent block -->
<div class="mario-block">
<!-- Checkbox input (disabled by default) -->
<input type="checkbox" id="1" disabled>
<!-- Checkbox label -->
<label for="1">
<!-- Inner dots for blocks -->
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</label>
</div>
</code></pre>
<p>Now we just add as many default blocks we want, along with the interactive punch block (<code>.mario-block--question</code>):</p>
<pre><code><div class="mario-block">
<input type="checkbox" id="1" disabled>
<label for="1">
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</label>
</div>
<div class="mario-block">
<input type="checkbox" id="2" disabled>
<label for="2">
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</label>
</div>
<div class="mario-block mario-block--question">
<input type="checkbox" id="3">
<label for="3">
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="question-mark"></div>
</label>
</div>
<div class="mario-block">
<input type="checkbox" id="4" disabled>
<label for="4">
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
<div class="dot"></div>
</label>
</div>
</code></pre>
<h2 id="the-css">The CSS</h2>
<p>First we need to remove the default <code>checkbox</code> input styling and place all new styling on it’s corresponding <code>label</code>.</p>
<pre><code>/* Mario block parent div */
.mario-block {
display: inline-block;
height: 80px;
margin-right: -7px; /* Fixes inline-block margin bug */
position: relative;
width: 80px;
}
/* Hide default checkbox input */
.mario-block input {
position: absolute;
visibility: hidden;
z-index: -1;
}
</code></pre>
<p>Now to target the <code>label</code> elements found inside the block:</p>
<pre><code>/* Style checkbox label accordingly */
.mario-block label {
background: #F88D2E;
border: 4px solid #070000;
box-shadow: inset -4px -4px 0 #965117, inset 4px 4px 0 #FAB89B;
display: block;
height: 100%;
position: relative;
width: 100%;
}
</code></pre>
<p>Next we style our included <code>.dots</code> elements to be placed in the four corners of each block:</p>
<pre><code>.mario-block .dot {
background: #070000;
height: 5px;
position: absolute;
width: 5px;
}
.mario-block .dot:nth-child(1) {
left: 4px;
top: 4px;
}
.mario-block .dot:nth-child(2) {
right: 4px;
top: 4px;
}
.mario-block .dot:nth-child(3) {
bottom: 4px;
left: 4px;
}
.mario-block .dot:nth-child(4) {
bottom: 4px;
right: 4px;
}
</code></pre>
<h3 id="punch-able-block">Punch-able block</h3>
<p>Now we need to include the “question mark” SVG and custom CSS for the interactive Mario block. You can download a copy of the custom <code>svg</code> question mark I created.</p>
<pre><code>.mario-block--question label {
cursor: pointer;
}
.mario-block--question .question-mark {
background-image: url('/public/images/mario-block-question-mark.svg');
background-position: center;
background-repeat: no-repeat;
background-size: 40px;
bottom: 0;
left: 0;
position: absolute;
right: 0;
top: 0;
z-index: 1;
}
</code></pre>
<h3 id="the-last-piece">The last piece</h3>
<p>The last item we need to design is the <code>checked</code> state of the interactive question mark block. The extra inner dark dashes will be added as <code>pseudo</code> elements:</p>
<pre><code>/* Mario block in `checked` state */
.mario-block input:checked + label {
background: #885818;
box-shadow: inset -4px -4px 0 #68400B, inset 4px 4px 0 #FAB89B;
}
/* Hide both the default dots and question mark svg on checked */
.mario-block input:checked + label .dot,
.mario-block input:checked + label .question-mark {
display: none;
}
/* Shared pseudo element styling */
.mario-block input:checked + label:before,
.mario-block input:checked + label:after {
content: '';
height: 20px;
position: absolute;
transform: rotate(45deg);
width: 20px;
}
/* Right dash */
.mario-block input:checked + label:before {
border-right: 4px solid #070000;
right: 18px;
top: 15px;
transform: rotate(45deg);
}
/* Left dash */
.mario-block input:checked + label:after {
border-left: 4px solid #070000;
left: 18px;
top: 15px;
transform: rotate(-45deg);
}
</code></pre>
<p>That’s it!</p>
<h2 id="taking-it-further">Taking it further</h2>
<p>As always, you can take this concept and flesh it out even further. I was trying to mimic the “pixel” style of the original Mario games, but you could make the lighting and depth more realistic with some extra subtle gradients or <code>filter</code> properties.</p>
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