Animate the button
<div class="login-box">
  <h2>LOGIN</h2>
  <form>
    <div class="user-box">
      <input type="text" name="" required="" />
      <lable>USERNAME</lable>
    </div>
    <div class="user=box">
      <input type="password" name="" required="" />
      <label>PASSWORD</label>
    </div>
    <a herf="#">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      SUBMIT
    </a>
  </form>
</div>
html{
  height: 100%;
}
body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: #f2ee3;
}

.login-box{
  position: absolute;
  top: 50%;
  left: 50%;
  width: 400px;
  padding: 40px;
  transform: translate(-50%,-50%);
  background: rgba(0,0,0,.5);
  box-sizing: border-box;
  box-shadow: 0 15px 25px rgba(0,0,0,.6);
  border-radius: 10px;
}

.login-box h2 {
  margin: 0 0 30px;
  padding: 0;
  color: #fff;
text-align: center;
}

.login-box .use-box{
  position: relative;
}

.login-box .user-box input{
  width: 100%;
  padding: 10px 0;
  font-size: 16px;
  color: #fff;
  margin-bottom: 30px;
  border: none;
  border-bottom: 1px solid #fff;
outline: none;
  background: transparent;
}
.login-box .user-box label {
  position: absolute;
  top: 0;
  left: 0;
  padding: 10px 0;
  font-size: 16px;
  color: #fff;
  pointer-events: none;
  transition: 5s;
}

.login-box .user-box input: focus ~ label,
.login-box .user-box input: valid ~ label{
 top: -20px;
   left: 0;
color: #03e9f4;
font-size: 12px;
}

.login-box form a {
  position: relative;
display: inline-block;
padding: 10px20px;
color: 03e9f4;
  font-size: 16px;
  text-decoration: none;
  text-transform: uppercase;
  overflow: hidden;
  transition:.5s;
  margin-top: 40px;
  letter-spacing: 4px;
}

.login-box a:hover {
  background: #03e9f4;
  color: #fff;
  border-radius: 5px;
  box-shadow: 0 0 5px #03e9f4,
          0 0 25px  #03e9f4,
          0 0 50px #03e9f4,
          0 0 100px #03e9f4,
  }

.login-box a span{
  position: absolute;
  display: block;
}

.login-box a span: nth-child(1) {
  top: 0;
  left: -100%;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg,transparent,#03e9f4);
animation: btn-anim1 1s linear infinite;
}

 @keyframes btn-anim1 {
 0% {
    left: -100%;
 }
50%,100% {
    left: 100%;
 }
}

.login-box a span: nth-child(2) {
top: -100%;
right: 0;
  width: 2px;
height:100%;
background: linear-gradient(180deg,transparent,#03e9f4);
  animation: btn-anim2 1s linear infinite;
  animation-delay: .25s;
}
@keyframes btn-anim2 {
0% {

  top: -100%;
}
50%,100%{
  top: 100%;
 }
}
  
.login-box a span:nth-child (3){
  bottom: 0;
  right: -100%;
width: 100%;
height: 2px;
background: linear-gradient(270deg,transparent,#03e9f4);
  animation: btn-anim3 1s linear infinite;
  animation-delay: .5s;
  }

@keyframes btn-anim3 {
  0%{
    right:-100;
  }
  50%,100%{
    right: 100%;
  }
  }

.login-box a span:nth-child(4){
  bottom:-100%;
  left: 0;
width:2px;
   height:100%;
  background: linear-gradient(360deg,transparent,#03e9f4);
    animation: btn-anim4 1s linear infinite;
    animation-delay: .75s;
}

@keyframes btn-anim4{
    0%{
   bottom: -100%;
}
    50%,100%{
    }
    }























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/* eslint no-undef: "off" */

Animate the button

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