How to Create CSS Button with Hover Effect

 <div class="container">
      <a href="#" class="btn">Hover me to show effect</a>
    </div>

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
   background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
    url(http://ask-me.in/wp-content/uploads/2019/05/code-coding-css-92905-e1559578232100.jpg)
      no-repeat center center/cover;
  font-family: Arial, Helvetica, sans-serif;
}

a {
  font-size: 1.5rem;
  padding: 1rem 3rem;
  color: #f4f4f4;
  text-transform: uppercase;
}

.btn {
  text-decoration: none;
  border: 1px solid rgb(146, 148, 248);
  position: relative;
  overflow: hidden;
}

.btn:hover {
  box-shadow: 1px 1px 25px 10px rgba(146, 148, 248, 0.4);
}

.btn:before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent,
    rgba(146, 148, 248, 0.4),
    transparent
  );
  transition: all 650ms;
}

.btn:hover:before {
  left: 100%;
}