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*, *:before, *:after {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.checkbox-group {
  padding: 50px;
}

.form-group {
  display: block;
  margin-bottom: 15px;
}

.form-group input {
  padding: 0;
  height: initial;
  width: initial;
  margin-bottom: 0;
  display: none;
  cursor: pointer;
}

.form-group label {
  position: relative;
  cursor: pointer;
}

.form-group label:before {
  content:'';
  -webkit-appearance: none;
  background-color: transparent;
  border: 2px solid #0079bf;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05), inset 0px -15px 10px -12px rgba(0, 0, 0, 0.05);
  padding: 10px;
  display: inline-block;
  position: relative;
  vertical-align: middle;
  cursor: pointer;
  margin-right: 5px;
}

.form-group input:checked + label:after {
  content: '';
  display: block;
  position: absolute;
  top: 2px;
  left: 9px;
  width: 6px;
  height: 14px;
  border: solid #0079bf;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

Pure CSS Custom Checkbox

How to create a custom checkbox style with pure CSS. When a checkbox is checked, it will display a checkmark within the checkbox.

You can change the color of the checkmark by changing the border property on CSS line 54.