.btn {
  color: #fff;
  cursor: pointer;
  // display: block;
  font-size:16px;
  font-weight: 400;
  line-height: 45px;
  margin: 0 0 2em;
  max-width: 160px; 
  position: relative;
  text-decoration: none;
  text-transform: uppercase;
  width: 100%; 
  
  &:hover { text-decoration: none; }
}

.btn-3 {
  background: lighten($red, 3%);  
  border: 1px solid darken($red, 4%);
  box-shadow: 0px 2px 0 darken($red, 5%), 2px 4px 6px darken($red, 2%);
  font-weight: 900;
  letter-spacing: 1px;
  transition: all 150ms linear;
}

.btn-3:hover {
  background: darken($red, 1.5%);
  border: 1px solid rgba(#000, .05);
  box-shadow: 1px 1px 2px rgba(#fff, .2);
  color: lighten($red, 18%); 
  text-decoration: none;
  text-shadow: -1px -1px 0 darken($red, 9.5%);
  transition: all 250ms linear;
}