*
{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html
{
  color: white;
  text-align: center;
}
body
{
  background: url("img/spaceBg.jpg") center no-repeat fixed;
  width: 100%;
  height: 100%;
  font-family: 'Space Mono', monospace;
  -webkit-font-smoothing: antialiased;
}
.astronaut
{
  position: relative;
  animation-name: astronaut;
  animation-duration: 120s;
  animation-iteration-count: infinite;
}
@keyframes astronaut
{
  0%   {left:-450px; top:40px;}
  25%  {left:450px; top:40px;}
  50%  {left:450px; top:-720px;}
  75%  {left:-450px; top:-720px;}
  100% {left:-450px; top:40px;}
}
.mainBlock
{
  width: 40%;
  height: 50%;
  position: relative;
  margin-left: 30%;
  margin-right: 30%;
  margin-top: 150px;
  padding-top: 30px;
  border-radius: 25px;
  background-color: rgba(50,50,50,0.50);
}
.topText
{
  font-size: x-large;
}
h1
{
  font-size: 1500%;
}
.bottomText
{
  font-size: x-large;
}
button
{
  width: 220px;
  height: 75px;
  margin-top: 55px;
  margin-bottom: 35px;
  border-radius: 15px;
  text-align: center;
  font-size: x-large;
  color: white;
  background-color: #094172;
}
button:hover
{
  color: #094172;
  background-color: white;
}
span
{
  text-align: center;
}
.textBase
{
  display: inherit;
}
.textHover
{
  display: none;
}
button:hover span.textBase
{
  display: none;
}
button:hover span.textHover
{
  display: inherit;
}