.middle{
  position: relative;
  top: 10%;
  transform: translateY(-50%);
  /* width: 100vw; */
  text-align: center;
}
.btn{
  display: inline-block;
  width: 60px;
  height: 60px;
  background: rgba(122, 122, 122, 0.08);
  margin: 10px;
  border-radius: 30%;
  box-shadow: 0 5px 10px -5px #00000070;
  color: #1d394d;
  overflow: hidden;
  position: relative;
}
.btn i{
  line-height: 60px;
  font-size: 26px;
  transition: 0.3s linear;
}
.btn:hover i{
  transform: scale(1.3);
  color: #f1f1f1;
}
.btn::before{
  content: "";
  position: absolute;
  width: 130%;
  height: 130%;
  background: hsl(0deg 0% 48% / 40%);
  transform: rotate(45deg);
  left: -110%;
  top: 90%;
}
.btn:hover::before{
  animation: aaa 0.7s 1;
  top: -10%;
  left: -10%;
}
@keyframes aaa {
  0%{
    left: -110%;
    top: 90%;
  }50%{
    left: 10%;
    top: -30%;
  }100%{
    top: -10%;
    left: -10%;
  }
}