a.css

body{
  display: inline-flex;
  justify-content:center;
  width: 100%;
height: 100vh;
  margin: 0;
  flex-wrap: wrap;
  background-color:rebeccapurple;
}
h1{
  font-size: 100px;
    margin: 0 auto;
  display: block;
  width: 100%;
  text-align:center;
  color: white;
  height:0;
animation: hanime .4s .5s linear ;
animation-fill-mode:backwards;
}
section{
  display: inline-flex;
  color: white;
  width: 40%;
  height: 50%;
  justify-content:center;
  flex-wrap: wrap;
  margin: 0 auto;
  border-radius: 30px;

}
.diva{
background: aqua;
width: 28%;
margin: 10px;
border-radius: 10px;
text-align:center;
padding-top: 10px;
font-size: 70px;
height: 25%;
animation: start 1s 1s;
animation-fill-mode: both;
}
.diva:hover{
  background-color:whitesmoke;
}
@keyframes  hanime{
  0%{
    transform: translate(-1000px);
    opacity: 0;
  }
  50%{
    transform: translate(-100px);
    opacity: .8;
  }
  90%{
    opacity: 1;
  transform: rotate(3deg);
  }
  100%{
    opacity: 1;
    transform: translate(0px);
  }
}
@keyframes  rotate{
  30%{
    transform: rotate(180deg);
  }
  70%{
    transform: rotate(270deg);
    opacity: .5;
  }
  100%{
    transform: rotate(360deg);
    opacity: 0;
  }
}
@keyframes start {

0%{
  opacity: 0;
}
  30%{
    transform: rotate(-90deg);
    opacity: .2;
  }
  70%{
    transform: rotate(-180deg);
     opacity: .6;
  }
  100%{
    transform: rotate(-360deg);
    opacity: 1;
  }
}
.won{
  transition: transform 1s 1.5s;
  transform: translateY(320px);
}
@keyframes back{
  25%{
    background-color: darkblue;
  }
  50%{
    background-color: darkred;
  }
  75%{
    background-color: greenyellow;
  }
  100%{
    background-color: coral;
  }
}
.back{
  animation: back 1.5s 1s;
  animation-iteration-count: infinite;
}