Check Password and Confirm Password

<html lang="en" dir="ltr">
  <head>
    <meta charset="UTF-8">
    
    <style>
    
/* Google Font Link */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@200;300;400;500;600;700&display=swap');
*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins" , sans-serif;
}
body{
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #4070F4;
  padding: 0 35px;
}
.wrapper{
  position: relative;
  background: #fff;
  max-width: 480px;
  width: 100%;
  padding: 35px 40px;
  border-radius: 6px;
  box-shadow: 0 5px 10px rgba(0,0,0,0.2);
}
.input-box{
  position: relative;
  height: 65px;
  margin: 25px 0;
}
.input-box input{
  position: relative;
  height: 100%;
  width: 100%;
  outline: none;
  color: #333;
  font-size: 18px;
  font-weight: 500;
  padding: 0 40px 0 16px;
  border: 2px solid lightgrey;
  border-radius: 6px;
  transition: all 0.3s ease;
}
.input-box input:focus,
.input-box input:valid{
  border-color: #4070F4;
}
.input-box i,
.input-box label{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #a6a6a6;
  transition: all 0.3s ease;
}
.input-box label{
  left: 15px;
  font-size: 18px;
  font-weight: 400;
  background: #fff;
  padding: 0 6px;
  pointer-events: none;
}
.input-box input:focus ~ label,
.input-box input:valid ~ label{
  top: 0;
  font-size: 14px;
  color: #4070F4;
}
.input-box i{
  right: 15px;
  cursor: pointer;
  padding: 8px;
}
.alert{
  display: flex;
  align-items: center;
  margin-top: -13px;
}
.alert .error{
  color: #D93025;
  font-size: 18px;
  display: none;
  margin-right: 8px;
}
 .text{
  font-size: 18px;
  font-weight: 400;
  color: #a6a6a6;
}
.input-box.button input{
  border: none;
  font-size: 20px;
  color: #fff;
  letter-spacing: 1px;
  background: #4070F4;
  cursor: not-allowed;
}
.input-box.button input.active:hover{
  background: #265df2;
  cursor: pointer;
}
  
  
  
    </style>
    
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta2/css/all.min.css"/>
   </head>
<body>
  <div class="wrapper">
      <div class="input-box">
        <input id="create_pw" type="password" required>
        <label>Create password</label>
      </div>
      <div class="input-box">
        <input id="confirm_pw" type="password" required disabled>
        <label>Confirm password</label>
        <i class="fas fa-eye-slash show"></i>
      </div>
      <div class="alert">
        <i class="fas fa-exclamation-circle error"></i>
        <span class="text">Enter at least 8 characters</span>
      </div>
      <div class="input-box button">
        <input id="button" type="button" value="Check" disabled>
      </div>
  </div>
  
  <script>
  const createPw = document.querySelector("#create_pw"),
   confirmPw = document.querySelector("#confirm_pw"),
   pwShow = document.querySelector(".show"),
   alertIcon = document.querySelector(".error"),
   alertText= document.querySelector(".text"),
   submitBtn = document.querySelector("#button");

pwShow.addEventListener("click", ()=>{
     if((createPw.type === "password") && (confirmPw.type === "password")){
       createPw.type = "text";
       confirmPw.type = "text";
       pwShow.classList.replace("fa-eye-slash","fa-eye");
     }else {
       createPw.type = "password";
       confirmPw.type = "password";
       pwShow.classList.replace("fa-eye","fa-eye-slash");
     }
   });

createPw.addEventListener("input", ()=>{
     let val = createPw.value.trim()
     if(val.length >= 8){
       confirmPw.removeAttribute("disabled");
       submitBtn.removeAttribute("disabled");
       submitBtn.classList.add("active");
     }else {
       confirmPw.setAttribute("disabled", true);
       submitBtn.setAttribute("disabled", true);
       submitBtn.classList.remove("active");
       confirmPw.value = "";
       alertText.style.color = "#a6a6a6";
       alertText.innerText = "Enter at least 8 characters";
       alertIcon.style.display = "none";
     }
   });

submitBtn.addEventListener("click", ()=>{
   if(createPw.value === confirmPw.value){
     alertText.innerText = "Password matched";
     alertIcon.style.display = "none";
     alertText.style.color = "#4070F4";
   }else {
     alertText.innerText = "Password didn't matched";
     alertIcon.style.display = "block";
     alertText.style.color = "#D93025";
   }
  });
  </script>

</body>
</html>

demo

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Check Password and Confirm Password