<!DOCTYPE html>
<html>
<head>
<title>Der Titel des Dokuments</title>
<style>
.exampleOne {
width: 28px;
height: 28px;
position: relative;
margin: 20px auto;
background: #fcfff4;
background: linear-gradient(top, #fcfff4 0%, #dfe5d7 40%, #b3bead 100%);
box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0, 0, 0, 0.5);
}
.exampleOne label {
width: 20px;
height: 20px;
position: absolute;
top: 4px;
left: 4px;
cursor: pointer;
background: linear-gradient(top, #222 0%, #45484d 100%);
box-shadow: inset 0px 1px 1px rgba(0, 0, 0, 0.5), 0px 1px 0px rgba(255, 255, 255, 1);
}
.exampleOne label:after {
content: '';
width: 16px;
height: 16px;
position: absolute;
top: 2px;
left: 2px;
background: #27ae60;
background: linear-gradient(top, #27ae60 0%, #145b32 100%);
box-shadow: inset 0px 1px 1px white, 0px 1px 3px rgba(0, 0, 0, 0.5);
opacity: 0;
}