<button class="custom-btn btn-1">Кнопка 17</button>

.custom-btn {
  width: 150px;
  height: 60px;
  color: #fff;
  border-radius: 30px;
  padding: 10px 25px;
  font-family: 'Lato', sans-serif;
  font-weight: 500;
  background: transparent;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  display: inline-block;
   box-shadow:inset 2px 2px 2px 0px rgba(255,255,255,.5),
   7px 7px 20px 0px rgba(0,0,0,.1),
   4px 4px 5px 0px rgba(0,0,0,.1);
  outline: none;
}
.btn-1 {
  background: rgb(6,14,131);
  background: linear-gradient(0deg, rgba(6,14,131,1) 0%, rgba(12,25,180,1) 100%);
  border: none;
}
.btn-1:hover {
   background: rgb(0,3,255);
background: linear-gradient(0deg, rgba(0,3,255,1) 0%, rgba(2,126,251,1) 100%);
}