button-style.css

* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

.buttons {
  margin: 10%;
  text-align: center;
}
.button {
  background-color: white;
  border: white solid;
  width: 100px;
  cursor: pointer;
}

.btn-hover {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  margin: 20px;
  text-align: center;
  border: none;
  background-size: 300% 100%;

  border-radius: 10px;
  moz-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  -webkit-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}

#show-hide:focus {
  box-shadow: 0 0 3pt 2pt rgb(12, 177, 177);
}

.btn-hover:hover {
  background-position: 100% 0;
  moz-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  -webkit-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}

.btn-hover:focus {
  box-shadow: 0 0 3pt 2pt rgb(12, 177, 177);
}

.btn-hover {
  background-image: linear-gradient(
    to right,
    #25aae1,
    #40e495,
    #30dd8a,
    #2bb673
  );
  box-shadow: 0 4px 15px 0 rgba(49, 196, 190, 0.75);
}