stijl.css

/* Trigger warning: There's CSS below. */

html {
  height: 100%;
  font-family: sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-text-size-adjust: 100%;
      -ms-text-size-adjust: 100%;
}
body {
  display: table;
  width: 100%;
  height: 100%;
  margin: 0;
  font-size: 1.5em;
  line-height: 1.2;
  text-align: center;
}
body * {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}
main,
aside {
  display: table-row;
}
main {
  height: 70%;
  font-size: 2em;
  letter-spacing: -.025em;
}
label,
p {
  display: table-cell;
  vertical-align: middle;
}
#checkbox {
  display: inline-block;
  position: relative;
  width: 1em;
  height: 1em;
  padding: 0;
  border: .05em solid rgba(0, 0, 0, .40);
  vertical-align: calc(-.17em);
  border-radius: .17em;
  box-shadow: 0 -.5em .05em -.1em #ececec inset, 0 0 .05em 0 rgba(0, 0, 0, .4);
  background-color: #fff;
  outline: none;
  cursor: pointer;
}
#checkbox.privilege-checked {
  cursor: auto;
}
#checkbox i,
aside p {
  opacity: 0;
}
#checkbox.privilege-checked i,
aside.privilege-checked p {
  opacity: 1;
}
#checkbox i {
  position: absolute;
  font-size: 1.4em;
  top: -.3em;
  right: -.1em;
  transition: 250ms ease-in-out opacity;
}
aside {
  height: 30%;
  font-size: .9em;
}
aside p {
  margin: 0;
  transition: 1500ms ease-in opacity;
}