* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}


.btn1 {
  position: relative;
  height: 70px;
  width: 70px;
  margin: 20px;
  background: rgb(214, 214, 214);
  border-radius: 50%;
  box-shadow: -7px -7px 20px 0 rgba(255, 255, 255, 0.9),
    7px 7px 20px 0 rgba(0, 0, 0, 0.3);
  transition: 0.2s;
}

.btn1:hover {
  transform: scale(1.1);
}

.btn1::before {
  content: "";
  position: absolute;
  height: 80%;
  width: 80%;
  background: rgb(214, 214, 214);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.btn1:hover::before {
  box-shadow: inset -7px -7px 20px 0 rgba(255, 255, 255, 1),
    inset 7px 7px 20px 0 rgba(0, 0, 0, 0.3);
}

.btn1 i {
  position: absolute;
  color: rgb(73, 192, 192);
  font-size: 35px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: 0.2s;
}

.btn1:hover i {
  font-size: 30px;
}