dash-website/_sass/_overlay-menu.scss

.container {
  position: absolute;
  width: 100%;
  height: 100%;
  text-align: center;
  top: 40%;
  left: 0;
  margin: 0 auto;
	p {
	  font-size: 18px;
	}
	a {
	  display: inline-block;
	  position: relative;
	  text-align: center;
	  color: #FF5252;
	  text-decoration: none;
	  font-size: 18px;
	  overflow: hidden;
	  top: 5px;
	}
	a:after {
	  content: '';
	  position: absolute;
	  background: #FF5252;
	  height: 2px;
	  width: 0%;
	  -webkit-transform: translateX(-50%);
	      -ms-transform: translateX(-50%);
	          transform: translateX(-50%);
	  left: 50%;
	  bottom: 0;
	  -webkit-transition: .35s ease;
	          transition: .35s ease;
	}
	.a:hover:after, a:focus:after, a:active:after {
	  width: 100%;
	}
}

#hero{
	.button_container {
	  position: absolute;
	  top: 40px;
	  right: 30px;
	  height: 23px;
	  width: 32px;
	  cursor: pointer;
	  z-index: 100;
	  -webkit-transition: opacity .25s ease;
	          transition: opacity .25s ease;
	  &:hover {
		opacity: .7;
	  }
		span {
		  background: $white;
		  border: none;
		  height: 4px;
		  width: 100%;
		  position: absolute;
		  top: 0;
		  left: 0;
		  -webkit-transition: all .35s ease;
		          transition: all .35s ease;
		  cursor: pointer;
		}
		span:nth-of-type(2) {
		  top: 8px;
		}
		span:nth-of-type(3) {
		  top: 16px;
		}
	
	}
	
	.button_container.active .top {
	  -webkit-transform: translateY(8px) translateX(0) rotate(45deg);
	      -ms-transform: translateY(8px) translateX(0) rotate(45deg);
	          transform: translateY(8px) translateX(0) rotate(45deg);
	  background: $white;
	}
	.button_container.active .middle {
	  opacity: 0;
	  background: $white;
	}
	.button_container.active .bottom {
	  -webkit-transform: translateY(-8px) translateX(0) rotate(-45deg);
	      -ms-transform: translateY(-8px) translateX(0) rotate(-45deg);
	          transform: translateY(-8px) translateX(0) rotate(-45deg);
	  background: $white;
	}
}

.button_container {
  position: absolute;
  top: 30px;
  right: 30px;
  height: 23px;
  width: 32px;
  cursor: pointer;
  z-index: 100;
  -webkit-transition: opacity .25s ease;
          transition: opacity .25s ease;
  &:hover {
	opacity: .7;
  }
	span {
	  background: $blue;
	  border: none;
	  height: 4px;
	  width: 100%;
	  position: absolute;
	  top: 0;
	  left: 0;
	  -webkit-transition: all .35s ease;
	          transition: all .35s ease;
	  cursor: pointer;
	}
	span:nth-of-type(2) {
	  top: 8px;
	}
	span:nth-of-type(3) {
	  top: 16px;
	}

}

.button_container.active .top {
  -webkit-transform: translateY(8px) translateX(0) rotate(45deg);
      -ms-transform: translateY(8px) translateX(0) rotate(45deg);
          transform: translateY(8px) translateX(0) rotate(45deg);
  background: $blue;
}
.button_container.active .middle {
  opacity: 0;
  background: $blue;
}
.button_container.active .bottom {
  -webkit-transform: translateY(-8px) translateX(0) rotate(-45deg);
      -ms-transform: translateY(-8px) translateX(0) rotate(-45deg);
          transform: translateY(-8px) translateX(0) rotate(-45deg);
  background: $blue;
}

.overlay {
  position: fixed;
  background: $black;
  top: 0;
  left: 0;
  width: 100%;
  height: 0%;
  opacity: 0;
  visibility: hidden;
  -webkit-transition: opacity .35s, visibility .35s, height .35s;
          transition: opacity .35s, visibility .35s, height .35s;
  overflow: hidden;
  
  .logo {
		width: 180px;
		height: auto;
		top: 30px;
		left: 30px;
		position: absolute;
	}
  
  nav {
	  position: relative;
	  height: 70%;
	  top: 50%;
	  -webkit-transform: translateY(-50%);
	      -ms-transform: translateY(-50%);
	          transform: translateY(-50%);
	  font-size: 36px;
	  font-weight: 200;
	  text-align: center;
	}
  
 	ul {
	  list-style: none;
	  padding: 0;
	  margin: 0 auto;
	  margin-top: 0px;
	  display: inline-block;
	  position: relative;
	  height: 100%;
		li {
		  display: block;
		  height: 16%;
		  height: calc(100% / 6);
		  min-height: 50px;
		  position: relative;
		  opacity: 0;
		}
		a {
		  display: block;
		  position: relative;
		  color: $white;
		  text-decoration: none;
		  overflow: hidden;
		  padding-bottom: 15px;
		  padding-top: 5px;
		}
		a:hover:after, a:focus:after, a:active:after {
			width: 100%;
		}
	}
	
	.sign-up-btn {
		border: none;
		padding: 30px;
		color: $green !important;
		&:hover {
			background: none !important;
			color: $green !important;
		}
	}
}
.overlay.open {
  opacity: 1;
  visibility: visible;
  height: 100%;
  li {
	  -webkit-animation: fadeInRight .5s ease forwards;
	          animation: fadeInRight .5s ease forwards;
	  -webkit-animation-delay: .35s;
	          animation-delay: .35s;
	}
	li:nth-of-type(2) {
	  -webkit-animation-delay: .4s;
	          animation-delay: .4s;
	}
	li:nth-of-type(3) {
	  -webkit-animation-delay: .45s;
	          animation-delay: .45s;
	}
	li:nth-of-type(4) {
	  -webkit-animation-delay: .50s;
	          animation-delay: .50s;
	}
}

@-webkit-keyframes fadeInRight {
  0% {
    opacity: 0;
    left: 20%;
  }
  100% {
    opacity: 1;
    left: 0;
  }
}

@keyframes fadeInRight {
  0% {
    opacity: 0;
    left: 20%;
  }
  100% {
    opacity: 1;
    left: 0;
  }
}