html {
  box-sizing: border-box;
}

*, *:after, *:before {
  box-sizing: inherit;
}

a {
  color: #333;
  text-decoration: none;
}

html {
  width: 100%;
  height: 100%;
}

body {
  background: #161616;     			/*main background color*/
  width: 100%;
  height: 100%;
  font-family: Arial, Helvetica, sans-serif;
  color: #666;					/*main text color*/
  padding: 0px;
}

h1 {
  width: 100%;
  text-align: center;
  padding: 50px 0;
}

.open {
  position: fixed;
  top: 10px;
  right: 50px;
  width: 50px;
  height: 50px;
  display: block;
  cursor: pointer;
  -webkit-transition: opacity 0.2s linear;
  transition: opacity 0.2s linear;
}
.open:hover {
  opacity: 1;
}
.open span {				/*hamburger closed settings*/
  display: block;
  float: left;
  clear: both;
  height: 4px;				/*thinkness of hamburger lines*/
  width: 40px;				/*width of lines*/
  border-radius: 25px;
  background-color: #fff;			/*humburger color*/			
  position: absolute;
  right: 3px;				/*position*/
  top: 2px;				/*position*/
  overflow: hidden;
  -webkit-transition: all 0.4s ease;
  transition: all 0.4s ease;
}
.open span:nth-child(1) {
  margin-top: 10px;
  z-index: 9;
}
.open span:nth-child(2) {
  margin-top: 25px;
}
.open span:nth-child(3) {
  margin-top: 40px;
}

.sub-menu {
  -webkit-transition: all 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transition: all 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  height: 0;
  width: 0;
  right: 0;
  top: 5;
  position: absolute;
  background-color: rgba(188, 13, 13, 0.54);			/*under circle color*/
  border-radius: 50%;
  z-index: 22;
  overflow: hidden;
}
.sub-menu li {
  display: block;
  float: right;
  clear: both;
  height: auto;
  margin-right: -160px;
  -webkit-transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}
.sub-menu li:first-child {
  margin-top: 200px;
}
.sub-menu li:nth-child(1) {
  -webkit-transition-delay: 0.10s;
}
.sub-menu li:nth-child(2) {
  -webkit-transition-delay: 0.20s;
}
.sub-menu li:nth-child(3) {
  -webkit-transition-delay: 0.30s;
}
.sub-menu li:nth-child(4) {
  -webkit-transition-delay: 0.40s;
}
.sub-menu li:nth-child(5) {
  -webkit-transition-delay: 0.50s;
}
.sub-menu li a {
  color: #fff;			/*menu text color*/
  font-family: 'Lato', Arial, Helvetica, sans-serif;
  font-size: 18px;		/*item text size*/
  width: 100%;
  display: block;
  float: left;
  line-height: 30px;		/*spacing between items*/
}

.oppenned .sub-menu {
  opacity: 0.8;		/*top layer*/
  height: 369px;	/*circle size*/
  width: 369px;
}
.oppenned span:nth-child(2) {
  overflow: visible;
}
.oppenned span:nth-child(1), .oppenned span:nth-child(3) {
  z-index: 100;
  -webkit-transform: rotate(45deg);
          transform: rotate(45deg);
}
.oppenned span:nth-child(1) {
  -webkit-transform: rotate(45deg) translateY(12px) translateX(12px);
          transform: rotate(45deg) translateY(12px) translateX(12px);
}
.oppenned span:nth-child(2) {
  height: 400px;
  width: 400px;
  right: -160px;
  top: -160px;
  border-radius: 50%;
  background-color: rgba(188, 5, 5, 0.54);			/*top circle color*/
}
.oppenned span:nth-child(3) {
  -webkit-transform: rotate(-45deg) translateY(-10px) translateX(10px);
          transform: rotate(-45deg) translateY(-10px) translateX(10px);
}
.oppenned li {
  margin-right: 168px;
}

.button {
  display: block;
  float: left;
  clear: both;
  padding: 20px 20px;
  background: #fff;
  border-radius: 3px;
  border: 2px solid #10a1ea;
  overflow: hidden;
  position: relative;
}
.button:after {
  -webkit-transition: -webkit-transform 0.3s ease;
  transition: -webkit-transform 0.3s ease;
  transition: transform 0.3s ease;
  transition: transform 0.3s ease, -webkit-transform 0.3s ease;
  content: "";
  position: absolute;
  height: 200px;
  width: 200px;
  -webkit-transform: rotate(45deg) translateX(-540px) translateY(-100px);
          transform: rotate(45deg) translateX(-540px) translateY(-100px);
  background: #10a1ea;
  z-index: 1;
}
.button:before {
  -webkit-transition: -webkit-transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transition: -webkit-transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55), -webkit-transform 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  content: attr(title);
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  color: #fff;
  z-index: 2;
  text-align: center;
  padding: 20px 20px;
  -webkit-transform: translateY(200px);
          transform: translateY(200px);
}
.button:hover {
  text-decoration: none;
}
.button:hover:after {
  -webkit-transform: translateX(-300px) translateY(-100px);
          transform: translateX(-300px) translateY(-100px);
}
.button:hover:before {
  -webkit-transform: translateY(0);
          transform: translateY(0);
}