<form>
  <p class="check">
    <input type="checkbox" name="abc" value="1" id="check1"><label class="checkbox-paint" for="check1">チェックボックス四角</label>
  </p>
  <p class="check">
    <input type="checkbox" name="def" value="2" id="check2"><label class="checkbox-mark" for="check2">チェックボックスチェックマーク</label>
  </p>
</form>
/* reset */
input,label,select,button,textarea{
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  margin:0;
  border:0;
  padding:0;
  display:inline-block;
  vertical-align:middle;
  white-space:normal;
  background:none;
}
input:focus,
select:focus,
textarea:focus{outline:0;}

.check input {
  display: none;
}
.check label {
  position: relative;
  padding: 4px 0 0 40px;
  cursor: pointer;
}
.check label::before,
.check label::after {
  position: absolute;
  content: '';
}
.check label::before {
  top: 0;
  left: 0;
  width: 30px;
  height: 30px;
  border: 1px solid #d0cfcf;
}
.check .checkbox-paint::after {
  top: 7px;
  left: 7px;
  width: 18px;
  height: 18px;
  background-color: #004099;
  opacity: 0;
}
.check .checkbox-mark::after {
  top: 50%;
  left: 10px;
  display: block;
  margin-top: -10px;
  width: 9px;
  height: 16px;
  border-right: 3px solid #004099;
  border-bottom: 3px solid #004099;
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
  opacity: 0;
}
.check input:checked + label::after {
  opacity: 1;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.