style.css

.overlay {
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  opacity: 0;
  visibility: hidden;
}
.overlay-open {
  animation: bgchange 1s linear infinite;
  opacity: 1 !important;
  visibility: visible !important;
}
.overlay nav {
  text-align: center;
  position: relative;
  top: 45%;
  height: 60%;
  font-size: 80px;
}
.overlay ul { list-style: none }

.mensa-image-container{
  height: 75px;
  overflow: hidden;
}
.mensa-logo{
  background-color:#f4ba1d;
}
ul li{
  list-style: none;
}
#coffee img{
  height: 25px;
  opacity: .25;
}

.op-1{
  opacity: 1 !important;
  visibility: visible !important;
}

@keyframes bgchange {
  0%{
    background-color: #03a9f4;
  }
  50% {
    background-color: #65ff00;
  }
  100% {
    background-color: #03a9f4;
  }
}

/* Christmas Lights START*/
.lightrope {
  text-align: center;
  display: block;
  white-space: nowrap;
  overflow: hidden;
  position: absolute;
  z-index: 1;
  margin: -18px 0 0 0;
  padding: 0;
  pointer-events: none;
  width: 100%;
}

.invisible{
  display: none;
}

.lightrope li {
  position: relative;
  -webkit-animation-fill-mode: both;
  animation-fill-mode: both;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  list-style: none;
  margin: 0;
  padding: 0;
  display: block;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  margin: 22px;
  display: inline-block;
  background: #00f7a5;
  box-shadow: 0px 4px 48px 3px #00f7a5;
  -webkit-animation-name: flash-1;
  animation-name: flash-1;
  -webkit-animation-duration: 2s;
  animation-duration: 2s;
}

.lightrope li:nth-child(2n+1) {
  background: cyan;
  box-shadow: 0px 4px 48px 3px rgba(0, 255, 255, 0.5);
  -webkit-animation-name: flash-2;
  animation-name: flash-2;
  -webkit-animation-duration: 0.4s;
  animation-duration: 0.4s;
}

.lightrope li:nth-child(4n+2) {
  background: #f70094;
  box-shadow: 0px 4px 48px 3px #f70094;
  -webkit-animation-name: flash-3;
  animation-name: flash-3;
  -webkit-animation-duration: 1.1s;
  animation-duration: 1.1s;
}

.lightrope li:nth-child(odd) {
  -webkit-animation-duration: 1.8s;
  animation-duration: 1.8s;
}

.lightrope li:nth-child(3n+1) {
  -webkit-animation-duration: 1.4s;
  animation-duration: 1.4s;
}

.lightrope li:before {
  content: "";
  position: absolute;
  background: #222;
  width: 22px;
  height: 8px;
  border-radius: 3px;
  top: -4px;
  left: 1px;
}

.lightrope li:after {
  content: "";
  top: -12px;
  left: 21px;
  position: absolute;
  width: 56px;
  height: 16px;
  border-bottom: solid #222 2px;
  border-radius: 50%;
}

.lightrope li:last-child:after {
  content: none;
}

.lightrope li:first-child {
  margin-left: -44px;
}

@-webkit-keyframes flash-1 {
  0%,
  100% {
    background: #ed4e53;
    box-shadow: 0px 4px 48px 3px #ed4e53;
  }

  50% {
    background: rgba(237, 78, 83, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(237, 78, 83, 0.2);
  }
}

@keyframes flash-1 {
  0%,
  100% {
    background: #ed4e53;
    box-shadow: 0px 4px 48px 3px #ed4e53;
  }

  50% {
    background: rgba(237, 78, 83, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(237, 78, 83, 0.2);
  }
}

@-webkit-keyframes flash-2 {
  0%,
  100% {
    background: #6ac8c9;
    box-shadow: 0px 4px 48px 3px #6ac8c9;
  }

  50% {
    background: rgba(106, 200, 201, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(106, 200, 201, 0.2);
  }
}

@keyframes flash-2 {
  0%,
  100% {
    background: #6ac8c9;
    box-shadow: 0px 4px 48px 3px #6ac8c9;
  }

  50% {
    background: rgba(106, 200, 201, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(106, 200, 201, 0.2);
  }
}

@-webkit-keyframes flash-3 {
  0%,
  100% {
    background: #54e874;
    box-shadow: 0px 4px 48px 3px #54e874;
  }

  50% {
    background: rgba(84, 232, 116, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(84, 232, 116, 0.2);
  }
}

@keyframes flash-3 {
  0%,
  100% {
    background: #54e874;
    box-shadow: 0px 4px 48px 3px #54e874;
  }

  50% {
    background: rgba(84, 232, 116, 0.4);
    box-shadow: 0px 4px 48px 3px rgba(84, 232, 116, 0.2);
  }
}
/* Christmas Lights END */