Animated Round Popup Menu With Pure CSS

An animated circle menu that popups around the menu toggle, built using CSS3 transitions and transforms.

How to use it:

Add the menu items together with the menu toggle button into your webpage.

<nav class="menu">
  <input type="checkbox" href="#" class="menu-open" name="menu-open" id="menu-open">
  <label class="menu-open-button" for="menu-open">
    <span class="lines line-1"></span>
    <span class="lines line-2"></span>
    <span class="lines line-3"></span>
  </label>
  <a href="#" class="menu-item item-1"></a>
  <a href="#" class="menu-item item-2"></a>
  <a href="#" class="menu-item item-3"></a>
  <a href="#" class="menu-item item-4"></a>
  <a href="#" class="menu-item item-5"></a>
  <a href="#" class="menu-item item-6"></a>
</nav>

Style the menu toggle button.

.menu-open-button {
  background: #EEEEEE;
  border-radius: 100%;
  width: 80px;
  height: 80px;
  margin-left: -40px;
  position: absolute;
  color: #FFFFFF;
  text-align: center;
  line-height: 80px;
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  -webkit-transition: -webkit-transform ease-out 200ms;
  transition: -webkit-transform ease-out 200ms;
  transition: transform ease-out 200ms;
  transition: transform ease-out 200ms, -webkit-transform ease-out 200ms;
}
.menu-open { display: none; }
.lines {
  width: 25px;
  height: 3px;
  background: #596778;
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -12.5px;
  margin-top: -1.5px;
  -webkit-transition: -webkit-transform 200ms;
  transition: -webkit-transform 200ms;
  transition: transform 200ms;
  transition: transform 200ms, -webkit-transform 200ms;
}
.line-1 {
  -webkit-transform: translate3d(0, -8px, 0);
  transform: translate3d(0, -8px, 0);
}
.line-2 {
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}
.line-3 {
  -webkit-transform: translate3d(0, 8px, 0);
  transform: translate3d(0, 8px, 0);
}
.menu-open:checked + .menu-open-button .line-1 {
  -webkit-transform: translate3d(0, 0, 0) rotate(45deg);
  transform: translate3d(0, 0, 0) rotate(45deg);
}
.menu-open:checked + .menu-open-button .line-2 {
  -webkit-transform: translate3d(0, 0, 0) scale(0.1, 1);
  transform: translate3d(0, 0, 0) scale(0.1, 1);
}
.menu-open:checked + .menu-open-button .line-3 {
  -webkit-transform: translate3d(0, 0, 0) rotate(-45deg);
  transform: translate3d(0, 0, 0) rotate(-45deg);
}
.menu-open-button {
  z-index: 2;
  -webkit-transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  transition-timing-function: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  -webkit-transition-duration: 400ms;
  transition-duration: 400ms;
  -webkit-transform: scale(1.1, 1.1) translate3d(0, 0, 0);
  transform: scale(1.1, 1.1) translate3d(0, 0, 0);
  cursor: pointer;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
}
.menu-open-button:hover {
  -webkit-transform: scale(1.2, 1.2) translate3d(0, 0, 0);
  transform: scale(1.2, 1.2) translate3d(0, 0, 0);
}
.menu-open:checked + .menu-open-button {
  -webkit-transition-timing-function: linear;
  transition-timing-function: linear;
  -webkit-transition-duration: 200ms;
  transition-duration: 200ms;
  -webkit-transform: scale(0.8, 0.8) translate3d(0, 0, 0);
  transform: scale(0.8, 0.8) translate3d(0, 0, 0);
}
.menu-open:checked ~ .menu-item {
  -webkit-transition-timing-function: cubic-bezier(0.935, 0, 0.34, 1.33);
  transition-timing-function: cubic-bezier(0.935, 0, 0.34, 1.33);
}
.menu-open:checked ~ .menu-item:nth-child(3) {
  transition-duration: 180ms;
  -webkit-transition-duration: 180ms;
  -webkit-transform: translate3d(0.08361px, -104.99997px, 0);
  transform: translate3d(0.08361px, -104.99997px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(4) {
  transition-duration: 280ms;
  -webkit-transition-duration: 280ms;
  -webkit-transform: translate3d(90.9466px, -52.47586px, 0);
  transform: translate3d(90.9466px, -52.47586px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(5) {
  transition-duration: 380ms;
  -webkit-transition-duration: 380ms;
  -webkit-transform: translate3d(90.9466px, 52.47586px, 0);
  transform: translate3d(90.9466px, 52.47586px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(6) {
  transition-duration: 480ms;
  -webkit-transition-duration: 480ms;
  -webkit-transform: translate3d(0.08361px, 104.99997px, 0);
  transform: translate3d(0.08361px, 104.99997px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(7) {
  transition-duration: 580ms;
  -webkit-transition-duration: 580ms;
  -webkit-transform: translate3d(-90.86291px, 52.62064px, 0);
  transform: translate3d(-90.86291px, 52.62064px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(8) {
  transition-duration: 680ms;
  -webkit-transition-duration: 680ms;
  -webkit-transform: translate3d(-91.03006px, -52.33095px, 0);
  transform: translate3d(-91.03006px, -52.33095px, 0);
}
.menu-open:checked ~ .menu-item:nth-child(9) {
  transition-duration: 780ms;
  -webkit-transition-duration: 780ms;
  -webkit-transform: translate3d(-0.25084px, -104.9997px, 0);
  transform: translate3d(-0.25084px, -104.9997px, 0);
}

The core CSS / CSS3 styles for the round menu.

.menu-item {
  background: #EEEEEE;
  border-radius: 100%;
  width: 80px;
  height: 80px;
  margin-left: -40px;
  position: absolute;
  color: #FFFFFF;
  text-align: center;
  line-height: 80px;
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  -webkit-transition: -webkit-transform ease-out 200ms;
  transition: -webkit-transform ease-out 200ms;
  transition: transform ease-out 200ms;
  transition: transform ease-out 200ms, -webkit-transform ease-out 200ms;
}
.menu {
  margin: auto;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 80px;
  height: 80px;
  text-align: center;
  box-sizing: border-box;
  font-size: 26px;
}
.menu-item:hover {
  background: #EEEEEE;
  color: #3290B1;
}
.menu-item:nth-child(3) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(4) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(5) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(6) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(7) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(8) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.menu-item:nth-child(9) {
  -webkit-transition-duration: 180ms;
  transition-duration: 180ms;
}
.item-1 {
  background-color: #669AE1;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-1:hover {
  color: #669AE1;
  text-shadow: none;
}
.item-2 {
  background-color: #70CC72;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-2:hover {
  color: #70CC72;
  text-shadow: none;
}
.item-3 {
  background-color: #FE4365;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-3:hover {
  color: #FE4365;
  text-shadow: none;
}
.item-4 {
  background-color: #C49CDE;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-4:hover {
  color: #C49CDE;
  text-shadow: none;
}
.item-5 {
  background-color: #FC913A;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-5:hover {
  color: #FC913A;
  text-shadow: none;
}
.item-6 {
  background-color: #62C2E4;
  box-shadow: 3px 3px 0 0 rgba(0, 0, 0, 0.14);
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.12);
}
.item-6:hover {
  color: #62C2E4;
  text-shadow: none;
}