Email Validation in JavaScript

<html lang="en" dir="ltr">
  <head>
    <meta charset="UTF-8">
    
    <style>
  /* Google Font CDN 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: linear-gradient(#4671EA,#AC34E7);
  padding: 0 20px;
}
form{
  max-width: 550px;
  width: 100%;
  background: #fff;
  padding: 30px;
  border-radius: 4px;
}
form .input-box{
  display: flex;
  height: 55px;
  align-items: center;
  position: relative;
}
.input-box input{
  height: 100%;
  outline: none;
  border: 2px solid #bfbfbf;
  border-radius: 4px;
  font-size: 18px;
  font-weight: 500;
  padding: 0 45px;
  transition: all 0.3s ease;
}
.input-box input.input{
  width: 75%;
  margin-right: 20px;
}
form.valid .input-box input.input{
  border-color: #4671EA;
}
.input-box input.input:focus{
  border-color: #4671EA;
}
form.error input.input{
  border-color: #de0611;
}
.input-box input.button{
  width: 25%;
  padding: 0;
  color: #fff;
  background: #4671EA;
  border: none;
  cursor: pointer;
}
.input-box input.button:hover{
  background: #1748cf;
}
.input-box i{
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
}
.input-box i.email-icon{
  color: #bfbfbf;
  left: 15px;
  transition: all 0.3s ease;
}
form.valid i.email-icon{
  color: #1748cf;
}
.input-box input.input:focus ~ i.email-icon{
  color: #1748cf;
}
.input-box .error-icon,
.input-box .passed-icon{
  color: #de0611;
  left: calc(75% - 60px);
  display: none;
}
form.error .error-icon{
  display: block;
}
.input-box .passed-icon{
  color: #1748cf;
}
form.valid .passed-icon{
  display: block;
}
form .text{
  color: #de0611;
  font-size: 16px;
  font-weight: 500;
  margin: 10px 0 -10px 2px;
}
form.valid .text{
  color: #1748cf;
}
   
    
    </style>
    
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
   </head>
<body>
  <form action="#">
    <div class="input-box">
      <input class="input" type="text" placeholder="Enter your email">
      <i class="fas fa-envelope email-icon"></i>
      <i class="fas fa-exclamation-circle error-icon"></i>
      <i class="fas fa-check-circle passed-icon"></i>
      <input class="button" type="submit" value="Check">
    </div>
    <p class="text"></p>
  </form>
  <script>
  //getting all attribute
  const form = document.querySelector("form"),
  eInput = form.querySelector(".input"),
  text = form.querySelector(".text");

form.addEventListener("submit", (e)=>{
    e.preventDefault(); //preventing form from submitting
    let pattern = /^[^ ]+@[^ ]+\.[a-z]{2,3}$/; //Regex pattern to validate email
    form.classList.add("error");
    form.classList.remove("valid");
    if(eInput.value == ""){
      text.innerText = "Email can't be blank";
    }else if (!eInput.value.match(pattern) ) { //if patter is not matched with user's enter value
      text.innerText = "Please enter a valid email";
    }else{
      form.classList.replace("error" , "valid"); //replacing error class with valid class
      text.innerText = "This is a valid email";
    }
  });
  </script>
</body>
</html>

demo

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Email Validation in JavaScript