checkbox.css

body{
	background-color: #8FBC8F;
	padding: 0;/*The CSS padding properties are used to generate space around an element's content, inside of any defined borders.*/
	margin: 0;/*The CSS margin properties are used to create space around elements, outside of any defined borders.*/
}

.box{
	position: absolute;
	top:50%;
	left: 50%;
	transform: translate(-50%, -50%);/*--The translate() method moves an element from its current position (according to the parameters given for the X-axis and the Y-axis).-->*/
}

input[type="checkbox"]{
	display: none;
}

label{
	position: relative;
	color: #fff;
	display: inline-block;/*This allows the text to wrap when it exceeds the element's width*/
	cursor: pointer;
	font-size: 100px;
}

label span{
	position: relative;
	top: 15px;
	display: inline-block;
	width: 90px;
	height: 90px;
	border: 5px solid #fff;
}

input[type="Checkbox"]:checked + label span:before{
	content: "";
	position: absolute;
	top: 10px;
	left: 10px;
	bottom: 10px;
	right: 10px;
	background: #fff;
	animation: ani 2s linear infinite;
}

/*@keyframes specifies the animation code.*/
@keyframes ani{
	0%{
		transform: rotate(0deg);
	}
	100%{
		transform: rotate(360deg);
	}
}