Result

SNSのPathっぽい円状のメニューです。
クリックでメニューが展開する、というもの。アイコンはfont-awesomeです

css

#menu {/*親要素*/
  width: 150px;
  height: 150px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -75px 0 0 -75px;
  list-style: none;
  font-size: 200%;
}

.menu-button {/*メニュー展開のトリガー要素*/
  opacity: 0;
  z-index: -1;
}

.menu-button {/*スタイル*/
  width: 150px;
  height: 150px;
  position: absolute;
  left: 50%;
  top: 50%;
  margin: -75px 0 0 -75px;
  border-radius: 50%;
  background: #424242;
  background-size: 100%;
  overflow: hidden;
  text-decoration: none;
}

#menu:not(:target) > a:first-of-type,
#menu:target > a:last-of-type {/*開閉用*/
  opacity: 1;
  z-index: 1;
}

#menu:not(:target) > .icon-plus:before,
#menu:target > .icon-minus:before {/*開閉用*/
  opacity: 1;
}

.menu-item {/*メニューのスタイル*/
  width: 70px;
  height: 70px;
  position: absolute;
  left: 55%;
  line-height: 5px;
  top: 50%;
  margin: -50px 0 0 -50px;
  border-radius: 50%;
  background-color: #424242;
  transform: translate(0px, 0px);
  transition: transform 500ms;
  z-index: -2;
  transition: 0.5s;
}

.menu-item:hover {
  opacity: 0.5;
}

.menu-item a {
  color: #fff;
  position: relative;
  top: 30%;
  left: 0;
  text-decoration: none;
}

/*位置調整*/
#menu:target > .menu-item:nth-child(6) {
  transform: rotate(60deg) translateY(-150px) rotate(300deg);
  transition-delay: 0s;
}

#menu:target > .menu-item:nth-child(5) {
  transform: rotate(20deg) translateY(-155px) rotate(-20deg);
  transition-delay: 0.1s;
}

#menu:target > .menu-item:nth-child(3) {
  transform: rotate(-20deg) translateY(-155px) rotate(20deg);
  transition-delay: 0.2s;
}

#menu:target > .menu-item:nth-child(4) {
  transform: rotate(-60deg) translateY(-150px) rotate(60deg);
  transition-delay: 0.3s;
}

.content {
  position: absolute;
  text-align: center;
  margin: -10px 0 0 -30px;
  top: 70%;
  left: 50%;
  font-size: 20px;
}

html

<div class="container">
  <ul id="menu">
    <a class="menu-button icon-plus" href="#menu"></a>
    <a class="menu-button icon-minus" href="#0"></a>
    <li class="menu-item">
      <a href="#menu">
                    <span class="fa fa-github"></span>
                </a>
    </li>
    <li class="menu-item">
      <a href="#menu">
                    <span class="fa fa-linkedin"></span>
                </a>
    </li>
    <li class="menu-item">
      <a href="#menu">
                    <span class="fa fa-instagram"></span>
                </a>
    </li>
    <li class="menu-item">
      <a href="#menu">
                    <span class="fa fa-twitter"></span>
                </a>
    </li>
  </ul>

</div>

via

Circle Menu #PureCss