.buttons {
  margin: 10%;
  text-align: center;
}

.btn-hover {
  width: 200px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  margin: 20px;
  height: 55px;
  text-align:center;
  border: none;
  background-size: 300% 100%;

  border-radius: 50px;
  moz-transition: all .4s ease-in-out;
  -o-transition: all .4s ease-in-out;
  -webkit-transition: all .4s ease-in-out;
  transition: all .4s ease-in-out;
}

.btn-hover:hover {
  background-position: 100% 0;
  moz-transition: all .4s ease-in-out;
  -o-transition: all .4s ease-in-out;
  -webkit-transition: all .4s ease-in-out;
  transition: all .4s ease-in-out;
}

.btn-hover:focus {
  outline: none;
}

.btn-hover.color-1 {
  background-image: linear-gradient(to right, #25aae1, #40e495, #30dd8a, #2bb673);
  box-shadow: 0 4px 15px 0 rgba(49, 196, 190, 0.75);
}
.btn-hover.color-2 {
  background-image: linear-gradient(to right, #f5ce62, #e43603, #fa7199, #e85a19);
  box-shadow: 0 4px 15px 0 rgba(229, 66, 10, 0.75);
}
.btn-hover.color-3 {
  background-image: linear-gradient(to right, #667eea, #764ba2, #6B8DD6, #8E37D7);
  box-shadow: 0 4px 15px 0 rgba(116, 79, 168, 0.75);
}
.btn-hover.color-4 {
  background-image: linear-gradient(to right, #fc6076, #ff9a44, #ef9d43, #e75516);
  box-shadow: 0 4px 15px 0 rgba(252, 104, 110, 0.75);
}
.btn-hover.color-5 {
  background-image: linear-gradient(to right, #0ba360, #3cba92, #30dd8a, #2bb673);
  box-shadow: 0 4px 15px 0 rgba(23, 168, 108, 0.75);
}
.btn-hover.color-6 {
  background-image: linear-gradient(to right, #009245, #FCEE21, #00A8C5, #D9E021);
  box-shadow: 0 4px 15px 0 rgba(83, 176, 57, 0.75);
}
.btn-hover.color-7 {
  background-image: linear-gradient(to right, #6253e1, #852D91, #A3A1FF, #F24645);
  box-shadow: 0 4px 15px 0 rgba(126, 52, 161, 0.75);
}
.btn-hover.color-8 {
  background-image: linear-gradient(to right, #29323c, #485563, #2b5876, #4e4376);
  box-shadow: 0 4px 15px 0 rgba(45, 54, 65, 0.75);
}
.btn-hover.color-9 {
background-image: linear-gradient(to right, #25aae1, #4481eb, #04befe, #3f86ed);
box-shadow: 0 4px 15px 0 rgba(65, 132, 234, 0.75);
}