How to create Advanced Button hover effect in HTML and CSS

Here is code for creating advanced button hover effect

See demo:- (https://codepen.io/iammanojrathod/pen/vYevVap)

HTML code:-

<header>
 <button class="btn1">Button1</button>
  <button class="btn2">Button2</button>
</header>

CSS code:-

*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
header{
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: black;
}
button{
  margin-right: 20px;
}
.btn1{
  color: #fff;
}
.btn2{
  color: #000;
}
.btn1, .btn2{
  position: relative;
  background: transparent;
  padding: 20px 30px;
  font-size: 30px;
  border: 2px solid #fff;
  cursor: pointer;
  z-index: 10;
  trasition: all 0.5s ease;
}
.btn1:before,
.btn1:after,
.btn2:before,
.btn2:after{
  content: '';
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  background: #fff;
  z-index: -1;
} 
.btn1:before {
  left: 0;
  transform: scaleX(0);
  transition: transform 0.5s;
  transform-origin: left;
}
.btn1:hover:before{
  transform: scaleX(1);
  transition: transform 0.5s;
  transform-origin: right;
}
.btn1:after {
  right: 0;
  transform: scaleX(0);
  transition: transform 0.5s;
  transform-origin: right;
}
.btn1:hover::after{
 transform: scaleX(1);
  transition: transform 0.5s;
  transform-origin: left;
}
.btn2:before {
  left: 0;
  transform: scaleX(1);
  transition: transform 0.5s;
  transform-origin: left;
}
.btn2:hover:before{
  transform: scaleX(0);
  transition: transform 0.5s;
  transform-origin: right;
}
.btn2:after {
  right: 0;
  transform: scaleX(1);
  transition: transform 0.5s;
  transform-origin: right;
}
.btn2:hover::after{
 transform: scaleX(0);
  transition: transform 0.5s;
  transform-origin: left;
}
.btn1:hover{
  color: #000;
}
.btn2:hover{
  color: #fff;
}

Thanks You ❤