v.02a
<form id="check-options-group">
<fieldset class="checkbox-options t-neutral">
<legend class="checkbox-options__title">Favourite animals? (select any that apply)</legend>
<input class="checkbox-options__input" id="check_option1" type="checkbox" name="animals" value="Dogs" />
<label class="checkbox-options__label" for="check_option1">Dogs</label>
<input class="checkbox-options__input" id="check_option2" type="checkbox" name="animals" value="Cats" />
<label class="checkbox-options__label" for="check_option2">Cats
</label>
<input class="checkbox-options__input" id="check_option3" type="checkbox" name="animals" value="Donkeys" />
<label class="checkbox-options__label" for="check_option3">Donkeys</label>
<input class="checkbox-options__input" id="check_option4" type="checkbox" name="animals" value="Horses" />
<label class="checkbox-options__label" for="check_option4">Horses</label>
<input class="checkbox-options__input" id="check_option5" type="checkbox" name="animals" value="Dolphins" />
<label class="checkbox-options__label" for="check_option5">Dolphins</label>
<input class="checkbox-options__input" id="check_option6" type="checkbox" name="animals" value="Sharks" />
<label class="checkbox-options__label" for="check_option6">Sharks</label>
</fieldset>
</form>
/* Theming */
.t-neutral.checkbox-options input[type="checkbox"]:checked + label {
background: #222;
border-color: #333;
color: #fff;
}
.high-contrast .checkbox-options input[type="checkbox"]:checked + label:before {
background:#eee;
}
.t-neutral.checkbox-options input[type="checkbox"]:checked + label:before {
transform: scale(1);
}
.t-neutral.checkbox-options input[type="checkbox"]:active + label {
background: #444;
color: #fff;
}
.t-neutral.checkbox-options input[type="checkbox"]:focus + label {
background: #444;
color: #fff;
}
.t-neutral .checkbox-options__label:before {
background-image: url("../img/check_tick.svg");
background-repeat: no-repeat;
background-position: 0 0;
}
.t-neutral .checkbox-options__label {
background: #eee;
border-color: #111;
color: #111;
}
.t-neutral .checkbox-options__label:hover {
background: #333;
color: #fff;
}
.checkbox-options__label:before {
content: "";
display: block;
height: 1em;
left: 1em;
/* This is a bit of a magic number here, you could vertically center any number of ways */
top:42%;
position: absolute;
transform: scale(0);
z-index:2;
transition: transform 0.4s cubic-bezier(.59,-0.44,.4,1.47);
width: 1.35em;
}
.checkbox-options__label {
border: 1px solid;
cursor: pointer;
display: inline-block;
padding: 3em;
position: relative;
text-align: center;
text-decoration: none;
transition: background 0.3s ease;
@media all and (max-width:48em) {
width: 100%;
}
}
/* Qualifier, since technique requires
adjacent selector,
we use sibling to cut the mustard
*/
.checkbox-options__title ~ .checkbox-options__input {
left: -9999px;
opacity: 0;
position: absolute;
visibility: none;
}
.high-contrast .checkbox-options__label:before {
border:1px solid #fff;
background:#222;
transition:background 0.3s ease;
}
<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="47.4px" height="19.4px" viewBox="-455 271.6 47.4 19.4" enable-background="new -455 271.6 47.4 19.4" xml:space="preserve">
<style type="text/css">
.svg-tick {
fill:#fff;
}
</style>
<g>
<rect class="svg-tick" x="-443.4" y="271" transform="matrix(-0.7026 -0.7116 0.7116 -0.7026 -950.1357 163.6479)" width="5" height="18.8"/>
<rect class="svg-tick" x="-450.6" y="277" transform="matrix(0.7116 -0.7026 0.7026 0.7116 -327.969 -233.2623)" width="5" height="11.7"/>
</g>
</svg>
TBD.
TBD.
TBD.
TBD.
TBD.
TBD.
TBD.
TBD.
TBD.