body-
{
  margin:0;
  padding:0;
  background: #0c002b;
  font-family:sans-serif;
}
.btn-animation > a{
  position:absolute;
  
  transform: translate(-50%,-50%);
  padding: 12px 30px;
  color: #fe971d;
  text-transform:none;
  text-decoration:none;  
  font-size:1.2rem;
  box-shadow: 0 20px 50px rgba(0,0,0,.5);
  overflow:hidden;
}

.btn-animation > a::before
{
  content:"";
  position:absolute;
  top:2px;
  left:2px;
  bottom:2px;
  width:50%;
  background:rgba(255,255,255,0.05);
  
}
.btn-animation > a span:nth-child(1)
{
  position:absolute;
  top:0;
  left:0;
  width:100%;
  height:2px;
  background:linear-gradient(to right, #0c002b ,#1779ff);
  animation: animate1 2s linear infinite;
  animation-delay:1s;
  
}
@keyframes animate1
{
  0%
  {
    transform:translateX(-100%);
}
  100%
  {
    transform:translateX(100%);
  }
}
.btn-animation > a span:nth-child(2)
{
  position:absolute;
  top:0;
  right:0;
  width:2px;
  height:100%;
  background:linear-gradient(to bottom, #0c002b ,#1779ff);
  animation: animate2 2s linear infinite;
  animation-delay:2s;
}
@keyframes animate2
{
  0%
  {
    transform:translateY(-100%);
}
  100%
  {
    transform:translateY(100%);
  }
}
.btn-animation > a span:nth-child(3)
{
  position:absolute;
  bottom:0;
  left:0;
  width:100%;
  height:2px;
  background:linear-gradient(to left, #0c002b ,#1779ff);
   animation: animate3 2s linear infinite;
  animation-delay:1s;
  
}
@keyframes animate3
{
  0%
  {
    transform:translateX(100%);
}
  100%
  {
    transform:translateX(-100%);
  }
}
.btn-animation > a span:nth-child(4)
{
  position:absolute;
  top:0;
  left:0;
  width:2px;
  height:100%;
  background:linear-gradient(to top, #0c002b ,#1779ff);
   animation: animate4 2s linear infinite;
  animation-delay:2s;
  
}
@keyframes animate4
{
  0%
  {
    transform:translateY(100%);
}
  100%
  {
    transform:translateY(-100%);
  }
}