index.css

* {
  box-sizing: border-box;
}

html {
  background: rgb(240 240 240);
}

body {
  min-height: 100vh;
  margin: 0;
  background: rgb(240, 240, 240);
  background: linear-gradient(0deg, rgb(224, 224, 224) 0%, rgb(240, 240, 240) 100%);
}

main {
  display: block;
  padding: 48px 96px;
}

.button-box {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  margin: 0 auto;
  margin-bottom: 40px;
}

.button {
  display: flex;
  position: relative;
  height: 110px;
  width: 110px;
  margin: 12px;
  justify-content: space-around;
  align-items: center;
  overflow: hidden;
  border-color: rgba(0, 0, 0, 0.01);
  background-color: rgba(255, 255, 255, 0.3);
  border-radius: 8px;
  border-style: solid;
  border-width: 1px 0px 0px 1px;
  box-shadow: 8px 8px 20px 0 rgba(113, 113, 113, 0.15),
    -8px -8px 20px 0 rgba(255, 255, 255, 0.6);
  transition: 2.0s ease;
}

.button-press {
  transition: 0.5s ease;
  background-color: rgba(0, 0, 0, 0.01);
  box-shadow: 0 0 0 0 transparent,
    0 0 0 0 transparent,
    inset 4px 4px 8px 0 rgba(0, 0, 0, 0.15),
    inset -4px -4px 8px 0 rgba(255, 255, 255, 0.6);
}

.button a {
  position: relative;
  width: 100%;
  height: 100%;
}

.button img {
  position: absolute;
  padding: 12px;
  width: 100%;
  height: 100%;
  transition: 1.0s ease;
}

.button-press img {
  transition: 0.5s ease;
  opacity: 0.2;
}

.button span {
  display: inline-flex;
  position: absolute;
  width: 100%;
  height: 100%;
  padding: 10px;
  bottom: -100%;
  color: #333;
  text-shadow: 2px 2px 8px rgba(255, 255, 255, 0.8);
  font-family: 'Biryani', sans-serif;
  font-size: 0.8rem;
  font-weight: bolder;
  text-align: center;
  justify-content: center;
  align-items: center;
  transition: 1.0s ease;
}

.button-press span {
  transition: 0.5s cubic-bezier(.4,.7,.6,1.1);
  bottom: 0;
}

.toad {
  position: relative;
  margin: auto;
  margin-top: 50px;
  width: 50px;
  height: 50px;
  bottom: 0px;
  transition: 0.5s ease
}

.toad a {
  width: 100%;
  height: 100%;
}

.toad img {
  width: 100%;
  height: 100%;
}

.toad:hover {
  transition: 2.0s ease;
  bottom: 10px;
  width: 80px;
  height: 80px;
  animation-name: toad-hover;
  animation-duration: 0.15s;
  animation-timing-function: ease;
  animation-iteration-count: infinite;
}

@keyframes toad-hover {
  50% {
    -webkit-transform: translateX(3px) rotate(2deg);
    transform: translateX(3px) rotate(2deg);
  }

  100% {
    -webkit-transform: translateX(-3px) rotate(-2deg);
    transform: translateX(-3px) rotate(-2deg);
  }
}

/* --- Footer Animation  ---------------------------------------------------- */
.footer-spacer {
  height: 16rem;
}

footer {
  display: block;
  position: fixed;
  width: 100vw;
  bottom: -30px;
  z-index: 1;
  
  transition: 2s ease;
  pointer-events: none;
}
.footer-hover {
  bottom: -60px;
}

footer-animation {
  display: block;
  position: relative;
  bottom: -80px;
  height: 20rem;
  
  pointer-events: none;
}

footer-animation>* {
  display: block;
  position: absolute;
  width: 6000px;
  height: 20rem;
}

footer-animation:after {
  content: "";
  position: absolute;
  right: 0;
  left: 0;
  z-index: 3;
  bottom: 0;
  
  box-shadow: 0 0 5rem 5rem #e6e6e6;
}

footer-animation svg {
  display: block;
  position: relative;
  z-index: 1;
  width: 6000px;
  height: 20rem;
}

footer-animation svg>* {
  pointer-events: auto;
}
  
animation-rear {
  z-index: 1;
  bottom: 2rem;
  
  animation: paralax 340s linear infinite;
}

animation-rear:before {
  content: "";
  position: absolute;
  top: 5rem;
  right: 0;
  left: 0;
  height: 2rem;
  
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0, #fff 100%);
}

animation-rear svg .m {
  fill: #f7f7f7;
}

animation-rear svg .m_trees {
  fill: #c9c9c9;
}

animation-rear svg .m_shading {
  fill: rgba(0, 0, 0, .05);
}

animation-front {
  z-index: 2;
  
  animation: paralax 180s linear infinite;
}

animation-front:before {
  content: "";
  position: absolute;
  top: 3rem;
  right: 0;
  left: 0;
  height: 7rem;
  
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0, #fff 100%);
}

animation-front:after {
  content: "";
  position: absolute;
  top: 3rem;
  right: 0;
  left: 0;
  height: 7rem;
  
  background: linear-gradient(to bottom, rgba(74, 74, 86, 0) 0, rgba(171, 171, 171, 0.25) 100%)
}

animation-front svg .h {
  fill: #fafafa;
}

animation-front svg .h_shading {
  fill: rgba(0, 0, 0, .05);
}

animation-trees {
  bottom: -2rem;
  z-index: 3;
  
  animation: paralax 160s linear infinite;
}

animation-trees svg .t {
  fill: #dadada;
}

animation-trees svg .t_shading {
  fill: rgba(0, 0, 0, .05);
}

@keyframes paralax {
  0%   { transform: translateX(0px); }
  100% { transform: translateX(-3000px); }
}


/* --- Helper Classes ------------------------------------------------------- */
.preload * {
  transition: none !important;
}