* {
  box-sizing: border-box;
}

body {
  font-family: sans-serif;
  background-image: url(" ");
  repeat: no-repeat;
}

.txt1 {
  color: #0070bb;
  font-size: 40px;
  font-weight: 800;
  text-align: center;
  margin-top: 20px;
}

.txt2 {
  color: #c8c6ce;
  font-size: 18px;
  text-align: center;
  margin-top: 20px;
}

.txt3 {
  color: #c8c6ce;
  font-size: 18px;
  text-align: center;
  margin-top: 20px;
}

.logo {
  text-align: center;
  margin-top: 10px;
}

.button {
  border: 2px solid none;
  padding: 10px 40px;
  background: #0070bb;
  color: white;
  text-align: center;
  width: 300px;
  border-radius: 25px;
  margin: 20px auto;
  transition: all 0.3s ease 0s;
  -webkit-box-shadow: 0px 11px 20px -8px rgba(0, 112, 187, 1);
  -moz-box-shadow: 0px 11px 20px -8px rgba(0, 112, 187, 1);
  box-shadow: 0px 11px 20px -8px rgba(0, 112, 187, 1);
}

.button:hover {
  border: 2px solid none;
  padding: 10px 40px;
  background: #0070bb;
  color: white;
  text-align: center;
  width: 300px;
  border-radius: 25px;
  margin: 5px auto;
  transition: all 0.3s ease 0s;
  -webkit-box-shadow: 0px 19px 34px -8px rgba(0, 112, 187, 1);
  -moz-box-shadow: 0px 19px 34px -8px rgba(0, 112, 187, 1);
  box-shadow: 0px 19px 34px -8px rgba(0, 112, 187, 1);
}

a .button {
  color: ffffff;
  text-align: center;
  font-size: 16px;
  text-decoration: none;
}

a {
  text-decoration: none;
}
a:hover {
  text-decoration: none;
}

#orbit-system {
  position: relative;
  width: 18em;
  height: 18em;
  margin: 0px auto;
}

.system {
  position: relative;
  width: 100%;
  height: 100%;

  -webkit-transform: rotateX(75deg) rotateY(-30deg);
  transform: rotateX(75deg) rotateY(-30deg);
  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.planet,
.satellite-orbit,
.satellite {
  position: absolute;
  top: 50%;
  left: 50%;

  -webkit-transform-style: preserve-3d;
  transform-style: preserve-3d;
}

.planet {
  width: 9em;
  height: 9em;
  margin-top: -20em;
  margin-left: -4.5em;

  border-radius: 50%;
  background-color: none;
  color: white;

  text-align: center;
  line-height: 9em;

  -webkit-transform: rotateY(30deg) rotateX(-75deg);
  transform: rotateY(30deg) rotateX(-75deg);
}

.satellite-orbit {
  width: 16em;
  height: 16em;
  margin-top: -8em;
  margin-left: -8em;

  /*border: 1px solid black;*/
  border-radius: 50%;

  -webkit-animation-name: orbit;
  animation-name: orbit;
  -webkit-animation-duration: 10s;
  animation-duration: 10s;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
}

.satellite {
  top: 100%;
  width: 7em;
  height: 7em;
  margin-top: -1.5em;
  margin-left: -1.5em;
  color: #fefefe;
  background-color: #0070bb;
  border-radius: 50%;
  text-align: center;
  font-weight: 600;
  line-height: 7em;
  -webkit-animation-name: invert-orbit;
  animation-name: invert-orbit;
  -webkit-animation-duration: 3s;
  animation-duration: 3s;
  -webkit-animation-iteration-count: infinite;
  animation-iteration-count: infinite;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
}

@-webkit-keyframes orbit {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}
@keyframes orbit {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(360deg);
  }
}

/*
In order to invert the rotation, do the rotate* transforms in reverse order.

Here, we rotated the system with rotateX(75deg) rotateY(-30deg), and then we are animating the rotation of the orbit with rotateZ(0-360deg). To reverse that, we need to reverse the last transform applied (rotateZ), then rotateY, then rotateX.

The rotateX/Y reversal is easy since it's not animated, so just use its opposite (30deg, -75deg). The rotateZ is trickier since it's animating, but since it's rotating from 0 to 360, we just need to animate the satellite from 360 to 0.
*/
@-webkit-keyframes invert-orbit {
  0% {
    transform: rotateZ(360deg) rotateY(30deg) rotateX(-75deg);
  }

  100% {
    transform: rotateZ(0deg) rotateY(30deg) rotateX(-75deg);
  }
}
@keyframes invert-orbit {
  0% {
    transform: rotateZ(360deg) rotateY(30deg) rotateX(-75deg);
  }

  100% {
    transform: rotateZ(0deg) rotateY(30deg) rotateX(-75deg);
  }
}