.clear-menu-btn {
  position: fixed;
  width: 50px;
  height: 50px;
  background-color: #111111;
  margin-left: -8px;
  z-index: 2;
}

.clear-menu-btn input[type="checkbox"] {
  position: absolute;
  filter: alpha(opacity=0);
  opacity: 0;
  width: 100%;
  height: 100%;
  z-index: 5;
}

.clear-menu-btn input[type="checkbox"]:hover { cursor: pointer; }

.clear-menu-btn input[type="checkbox"]:checked ~ .top, .clear-menu-btn input[type="checkbox"]:checked ~ .bottom { top: 50%; }

.clear-menu-btn input[type="checkbox"]:checked ~ .top {
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}

.clear-menu-btn input[type="checkbox"]:checked ~ .bottom {
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -ms-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

.clear-menu-btn input[type="checkbox"]:checked ~ .middle {
  filter: alpha(opacity=0);
  opacity: 0;
}

.clear-menu-btn input[type="checkbox"]:checked ~ .circle {
  filter: alpha(opacity=100);
  opacity: 1;
}

.clear-menu-btn span {
  position: absolute;
  display: block;
  margin-left: 5px;
  width: 40px;
  height: 2px;
  background-color: #fff;
  -webkit-transition: all 0.3s;
  -moz-transition: all 0.3s;
  -ms-transition: all 0.3s;
  -o-transition: all 0.3s;
  transition: all 0.3s;
}

.clear-menu-btn .top { top: 15%; }

.clear-menu-btn .middle { top: 50%; }

.clear-menu-btn .bottom { top: 85%; }

.clear-menu-btn .circle {
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
  filter: alpha(opacity=0);
  opacity: 0;
  margin-left: 0px;
  width: 40px;
  height: 40px;
  background-color: transparent;
  border-radius: 50%;
  border: 2px solid #fff;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
  transition: all 0.5s;
  z-index: 0;
}