intro.css

.title{
  color: pink;
  text-align: center;
  font-size: 50pt;
  font-family: sans-serif;
  animation-name: example;
  animation-duration: 1s;
  animation-iteration-count: infinite;
}

#background {
  width: 100%;
  height: 100%;
  position: fixed;
  left: 0px;
  top: 0px;
  z-index: -99999;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  user-select: none;
}
#background img {
  width: 100%;
  height: 100%;
}

@keyframes example{
  0%{color: #93c648;}
  25%{color: #8d44b6;}
  50%{color: #f13a70;}
  75%{color: #119cdd;}
  100%{color: #fa9501;}
  }


.butt{
  padding: 10px 20px;
  background-color: #fa9501;
  color: white;
  border-radius: 50px;
  border:4px solid #119cdd;
  text-align: center;
  font-size: 20px;
  transition-duration: 0.5s;
  cursor: pointer;
  display: inline-block;
  margin-left: auto;
  margin-right: auto;
}
.butt:hover{
  background-color: #8d44b6;
  color:red;
}
.butt:active{
  transform: translateY(15px);
}

.butt1:active{
  transform: translateY(15px);
}
.butt1:hover{
  background-color: #f452af;
  color: black;
}