Checkboxes in web pages – how to make them bigger?

Question

In case this can help anyone, here's simple CSS as a jumping off point. Turns it into a basic rounded square big enough for thumbs with a toggled background color.

input[type='checkbox'] {
    -webkit-appearance:none;
    width:30px;
    height:30px;
    background:white;
    border-radius:5px;
    border:2px solid #555;
}
input[type='checkbox']:checked {
    background: #abd;
}

<input type="checkbox" />

Actually there is a way to make them bigger, checkboxes just like anything else (even an iframe like a facebook button).

Wrap them in a "zoomed" element:

.double {
  zoom: 2;
  transform: scale(2);
  -ms-transform: scale(2);
  -webkit-transform: scale(2);
  -o-transform: scale(2);
  -moz-transform: scale(2);
  transform-origin: 0 0;
  -ms-transform-origin: 0 0;
  -webkit-transform-origin: 0 0;
  -o-transform-origin: 0 0;
  -moz-transform-origin: 0 0;
}

<div class="double">
  <input type="checkbox" name="hello" value="1">
</div>

It might look a little bit "rescaled" but it works.

Of course you can make that div float:left and put your label besides it, float:left too.

Try this CSS

input[type=checkbox] {width:100px; height:100px;}

I tried changing the padding and margin and well as the width and height, and then finally found that if you just increase the scale it'll work:

input[type=checkbox] {
    transform: scale(1.5);
}

Pure modern 2020 CSS only decision, without blurry scaling or non-handy transforming. And with tick! =)

Works nice in Firefox and Chromium-based browsers.

So, you can rule your checkboxes purely ADAPTIVE, just by setting parent block's font-size and it will grow with text!

input[type='checkbox'] {
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
  vertical-align: middle;
  outline: none;
  font-size: inherit;
  cursor: pointer;
  width: 1.0em;
  height: 1.0em;
  background: white;
  border-radius: 0.25em;
  border: 0.125em solid #555;
  position: relative;
}

input[type='checkbox']:checked {
  background: #adf;
}

input[type='checkbox']:checked:after {
  content: "✔";
  position: absolute;
  font-size: 90%;
  left: 0.0625em;
  top: -0.25em;
}

<label for="check1"><input type="checkbox" id="check1" checked="checked" /> checkbox one</label>
<label for="check2"><input type="checkbox" id="check2" /> another checkbox</label>
<label for="check3" style="font-size:150%"><input type="checkbox" id="check3" checked="checked" /> bigger checkbox </label>