body {
  margin: 0;
  padding: 0;
}
.tombol {
  border: 2px solid #1e90ff;
  background: none;
  padding: 10px 20px;
  font-size: 20px;
  font-weight: 500;
  cursor: pointer;
  margin: 10px;
  transition: 0.8s;
  position: relative;
  overflow: hidden;
}
.tombol2 {
  border: 2px solid #fff;
  background: none;
  padding: 10px 20px;
  font-size: 20px;
  font-weight: 500;
  cursor: pointer;
  margin: 10px;
  transition: 0.8s;
  position: relative;
  overflow: hidden;
}
.btn1 {
  color: #1e90ff;
}
.btn2 {
  color: #fff;
}
.btn3 {
  color: #fff;
}

.btn1:hover {
  color: #fff;
}
.btn2:hover {
  color: #1e90ff;
}
.btn3:hover {
  color: #1e90ff;
}
.tombol::before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 0%;
  background: #1e90ff;
  z-index: -1;
  transition: 0.8s;
}
.tombol2::before {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 0%;
  background: #fff;
  z-index: -1;
  transition: 0.8s;
}

.btn1::before,
.btn2::before,
.btn3::before {
  top: 0;
  border-radius: 0 0 50% 50%;
}
.btn2::before {
  height: 180%;
}
.btn1:hover::before {
  height: 180%;
}
.btn2:hover::before {
  height: 0%;
}
.btn3:hover::before {
  height: 180%;
}