.back:hover{
  animation: rotation 2.5s infinite linear;
}

@keyframes rotation {
  0% {
    transform: rotate(-50deg);
  }
  50% {
    transform: rotate(50deg);
  }
  100% {
    transform: rotate(-50deg);
  }
}
body{
  background-image: url('https://ygdrzil.neocities.org/stories/bear.png');
  background-size: cover;
}
.main{
  background: rgba(27, 77, 40, 0.85);
  width: 965px;
  height: 730px;
  border-radius: 50px;
  left: 125px;
  top: 50px;
  position: absolute;
  text-align: justify;
  box-shadow: 24px 24px 28px 0 rgba(0, 0, 0, 0.5);
}

.main img{
  margin: 100px;
}
.covers{
  height:300px; 
  width:200px;
  padding-left: 50px;
  padding-top: 50px;
  border-radius: 30px;
}
.cover1{
  margin-left: 115px;
  margin-top: -115px;
}
.cover2{
  margin-left: 490px;
  margin-top: -115px;
}
.shadows{
  background: transparent;
  height: 50px; 
  width: 50px;
  margin-left: 1050px;
  margin-top: 690px;
  border-radius: 50px;
}
p{
  position: absolute;
  text-align: center;
  font-family: courier;
  color: #eef0f4;
  font-size:80%;
  text-shadow: 1px 1px black;
}
a {
    color: #eef0f4;
    text-decoration: none;
}

a:hover {
    color: #587791; 
    text-decoration:none; 
    cursor:pointer;  
}