*{margin:0;padding:0;list-style-type:none;}
body {
  overflow: hidden;
  height: 100vh;
  width: 100vw;
  background-image: radial-gradient(circle farthest-corner at 100% 0%, #ffa500, 50%, lightblue 90%);
  background-attachment: fixed;
}

#sun {
  position: absolute;
  z-index: -10;
  top: 2%;
  right: 0%;
  font-size: 5em;
  -webkit-animation: sunshine 180s infinite alternate;
          animation: sunshine 180s infinite alternate;
}

@-webkit-keyframes sunshine {
  to {
    -webkit-transform: rotate(360deg);
            transform: rotate(360deg);
  }
}

@keyframes sunshine {
  to {
    -webkit-transform: rotate(360deg);
            transform: rotate(360deg);
  }
}
.tree {
  position: absolute;
  bottom: 40px;
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  -webkit-box-align: center;
          align-items: center;
}
.tree__1, .tree__2, .tree__3, .tree__5 {
  width: 0;
  height: 0;
  border-radius: 10%;
}
.tree__5 {
  /*added this top branch on last-sw */
  border: 20px solid transparent;
  border-bottom: 25px solid #a7ac5c;
}
.tree__1 {
  border: 45px solid transparent;
  border-bottom: 50px solid #878822;
  margin-top: -60px;
}
.tree__2 {
  border: 60px solid transparent;
  border-bottom: 65px solid #4a560c;
  margin-top: -80px;
}
.tree__3 {
  border: 70px solid transparent;
  border-bottom: 80px solid #303b2b;
  margin-top: -100px;
}
.tree__4 {
  /*trunk base*/
  width: 10px;
  height: 50px;
  background: #211610;
}

#grass {
  background-image: -webkit-gradient(linear, right top, left top, from(#878822), to(#42aa46));
  background-image: linear-gradient(to left, #878822, #42aa46);
  position: absolute;
  bottom: 0;
  width: 100vw;
  height: 40px;
}

#bug {
  -webkit-transform-origin: 0% 100%;
          transform-origin: 0% 100%;
  -webkit-transform: rotate(100deg);
          transform: rotate(100deg);
  -webkit-animation: walk 200s infinite ease-in-out;
          animation: walk 200s infinite ease-in-out;
}

@-webkit-keyframes walk {
  to {
    -webkit-transform: translateX(102vw) rotate(90deg);
            transform: translateX(102vw) rotate(90deg);
  }
}

@keyframes walk {
  to {
    -webkit-transform: translateX(102vw) rotate(90deg);
            transform: translateX(102vw) rotate(90deg);
  }
}