assets/css/controls/checkbox/box.css

.checkbox-box {
	display: inline-block;
	height: 20px;
	vertical-align: middle;
	width: 20px;
}

.checkbox-box input[type=checkbox] {
	max-height: 0;
	max-width: 0;
	opacity: 0;
	position: absolute;
}

.checkbox-box input[type=checkbox] + label {
	border-radius: 4px;
	border: 2px solid #212529;
	cursor: pointer;
	display: block;
	height: 20px;
	margin-bottom: 0;
	margin-top: 0;
	position: relative;
	text-indent: -5000px;
	width: 20px;
}

.checkbox-box input[type=checkbox] + label:before {
	border-color: #212529;
	border-style: solid;
	border-width: 0px 0px 2px 2px;
	content: "";
	display: block;
	height: 5px;
	left: 8px;
	opacity: 0;
	position: absolute;
	top: 7px;
	transform: translate3d(-50%, -50%, 0px) rotate(-45deg);
	transition: .1s ease-in-out;
	width: 7px;
}

.checkbox-box input[type=checkbox]:checked + label {
	border-color: #212529;
}

.checkbox-box input[type=checkbox]:focus + label {
	box-shadow: 0 0 0 0.25rem rgb(13 110 253 / 25%);
	outline: 0;
}

.checkbox-box input[type=checkbox]:hover + label:before {
	border-color: #212529;
	opacity: 0.5;
}

.checkbox-box input[type=checkbox]:checked + label:before {
	border-color: #212529;
	opacity: 1;
}