CSS Touch Ripple Effect, Not Working Properly
<p>My CSS touch ripple is not working properly. It is just seen like a bubble in the center when i click on the button. Please help in finding where am i doing the mistake. i am not much known to CSS animations. i would like to do this using just CSS only.</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>.ripple-con,
.button {
  display: inline-block;
  position: relative;
  overflow: hidden;
}

.button::after,
.ripple {
  content: ' ';
  background: rgba(0, 0, 0, 0.3);
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  display: inline-block;
  border-radius: 100%;
}

.button:active::after,
.ripple:active,
.button:active+.ripple {
  animation: ripple 2s;
}

@keyframes ripple {
  to {
    opacity: 0;
    margin: -250px;
    width: 500px;
    height: 500px;
  }
}

.button {
  line-height: 39px;
  border: 0;
  height: 42px;
  box-sizing: border-box;
  padding: 0 20px;
  background: #888;
  border-radius: 5px;
  cursor: default;
  vertical-align: top;
}

html {
  text-align: center
}

body {
  display: inline-block
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="ripple-con"&gt;
  &lt;input class="button" type="submit" value="Submit Button : Button"&gt;
  &lt;span class="ripple"&gt;&lt;/span&gt;
&lt;/div&gt;

&lt;div class="ripple-con"&gt;
  &lt;input class="button" type="button" value="Input Button : Button"&gt;
  &lt;span class="ripple"&gt;&lt;/span&gt;
&lt;/div&gt;

&lt;div class="button"&gt;Div : Button&lt;/div&gt;

&lt;button class="button"&gt;Button : Button&lt;/button&gt;</code></pre>
</div>
</div>
</p>