.btn{
  color: #f75700;
  font-family:'Alegreya Sans', sans-serif;
  font-size: 18px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 2px 15px;
  border-radius: 0;
  border: 2px solid #f75700;
  position: relative;
  margin: 0 10px;
  z-index: 1;
  transition: all 0.5s ease;
} 

.btn:hover,
.btn:focus{ 
  color:#f90000; 
  border: 2px solid #f90000;
  border-radius: 30px;
}

.btn:before{
  content: " ";
  width: calc(100% + 20px);
  height: calc(100% + 20px);
  border: 2px  solid transparent;
  transform: translateX(-50%) translateY(-50%);
  position: absolute;
  left: 50%;
  top: 50%;
  transition: all 0.7s ease;
}

.btn:hover:before{
  border-radius: 30px;
  border: 2px solid #f90000; 
}

@media only screen and (max-width: 767px){
  .btn{ margin-bottom: 30px; }
}