CodePen

HTML

            
              <ul class='menu circ-menu'>
  <li class='menu-item'>
    <a href='#'>☊</a>
  </li>
  <li class='menu-item selected'>
    <a href='#'>☁☀</a>
    <ul class='menu submenu'>
      <li><a href='#'>☂</a></li><!--
      --><li><a href='#'>☁</a></li><!--
      --><li><a href='#'>☃</a></li>
    </ul>
  </li>
  <li class='menu-item'>
    <a href='#'>✦</a>
  </li>
</ul>
            
          
!

CSS

            
              html {
  height: 100%;
  background: linear-gradient(90deg, violet, white);
  background-size: 2em 100%
}
.menu { padding: 0; list-style: none; }
.menu a {
  display: block;
  color: #666561;
  font: 900 2em/2.5 monospace;
  text-decoration: none;
  text-shadow: 0 1px white;
}
.circ-menu {
  overflow: hidden;
  position: relative;
  margin: 1em auto;
  padding: 5em 0 0;
  width: 20em; height: 10em;
  box-shadow: 0 .5em .5em -.5em;
}
.menu-item {
  overflow: hidden;
  position: absolute;
  z-index: 0;
  left: -50%; bottom: 0;
  width: 20em; height: 20em;
  transform-origin: 100% 100%;
}

/* === style the menu items (slices) === */

/* three slices making up half a circle mean that a slice is going to have a central_angle = 60deg */
.menu-item:first-child {
  transform: skewX(30deg) /* 90deg - central_angle */;
}
.menu-item:nth-child(2) {
  /* rotate by the value of the central angle multiplied with how many slices are before */
  transform: 
    rotate(60deg) /* 60deg = 1*central angle */
    skewX(30deg) /* 90deg - central_angle */;
}
.menu-item:last-child {
  transform: 
    rotate(120deg) /* 120deg = 2*central angle */
    skewX(30deg) /* 90deg - central_angle */;
}

/* === contents of the menu items === */
.menu-item > * {
  position: absolute;
  top: 55%; left: 55%;
  width: 90%; height: 90%;
  text-align: center;
}
.menu-item > a {
  border-radius: 50%;
  box-shadow: 0 0 0 .2em #aaa497, 
    0 0 .5em .2em black;
  transform:
    skewX(-30deg) /* unskew */
    rotate(-60deg);
  background: #f8f4ef;
  background: 
    radial-gradient(transparent 39%, #f7f3ee 40%);
}
.selected > a { z-index: 1; }
.selected > a, .menu a:hover {
  color: #e96429;
}
.selected > a, .menu-item > a:hover {
  box-shadow: 0 0 0 .2em #e96429, 
    0 0 .5em .2em black;
  background: 
    linear-gradient(60deg, #e96429 31%, rgba(247, 243, 238, 0) 33%),
    linear-gradient(-60deg, #e96429 31%, rgba(247, 243, 238, 0) 33%),
    radial-gradient(transparent 39%, #f7f3ee 40%);
  background-size: 100% 26%,  100% 26%, 100% 100%;
}

.submenu {
  z-index: 0;
  transform: 
    skewX(-30deg) /* unskew */
    rotate(-60deg)
    translateY(-5.25em);
}
.submenu li {
  display: inline-block;
  position: relative;
  border-top: solid 1px #666561;
  border-bottom: solid 1px #666561;
  width: 3.2em; height: 3.2em;
  background: #f7f3ee;
}
.submenu li:before {
  position: absolute;
  bottom: 0; left: 0;
  width: 100%; height: .2em;
  background: #666561;
  content: '';
}
.submenu a {
  line-height: 2
}
.submenu li:first-child {
  border-radius: .3em 0 0 .3em;
  border-left: solid 1px #666561;
}
.submenu:after {
  position: absolute;
  z-index: -1;
  top: 2.5em; left: 50%;
  margin: 0 -.6em;
  width: 1.2em; height: 1.2em;
  transform: rotate(-30deg) skewX(30deg);
  background: #666561;
  content: '';
}
.submenu li:last-child {
  border-radius: 0 .3em .3em 0;
  border-right: solid 1px #666561;
}

.circ-menu:before, .circ-menu:after {
  position: absolute;
  z-index: 1;
  bottom: -7.071em; left: 14.645%;
  width: 14.142em; height: 14.142em;
  border-radius: 50%;
  content: '';
}
.circ-menu:before {
  bottom: -5em; left: 5em;
  width: 10em; height: 10em;
  box-shadow: inset 0 0 .75em black, 
    0 0 .5em .2em #f7f3ee;
}
.circ-menu:after {
  bottom: -1em; left: 9em;
  width: 2em; height: 2em;
  box-shadow: 0 0 .4em dimgrey, 
    0 0 0 .75em #e27447, 
    0 0 .4em .75em dimgrey, 
    0 0 0 2em #f7f3ee, 
    0 0 .4em 2em dimgrey;
  background: #f7a480;
}
            
          
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