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HTML 

              
                <div id="root"></div>
!

CSS 

              
                *,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Montserrat, sans-serif;
  height: 100vh;
  display: grid;
  justify-content: center;
  align-items: center;
  color: #4f546c;
  background-color: #1f1d2b;
}

.container {
  background-color: white;
  padding: 2rem;
  border-radius: 0.2rem;
  width: 20rem;
}
.container__header {
  margin-bottom: 2rem;
}

.form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.form__group {
  display: flex;
  flex-direction: column;
  position: relative;
}
.form__label {
  position: absolute;
  top: -0.5rem;
  left: 0.5rem;
  background-color: white;
  padding: 0 0.5rem;
  font-size: 0.8rem;
}
.form__input {
  padding: 1rem;
  font-family: inherit;
  color: inherit;
  outline: none;
  border: 1px solid #c7ccdb;
  border-radius: 0.2rem;
}
.form__successicon, .form__erroricon {
  position: absolute;
  right: 1rem;
  top: 1rem;
  width: 1rem;
  display: none;
}
.form__successicon {
  fill: #00c853;
}
.form__erroricon {
  fill: #ff1744;
}
.form__message {
  font-size: 0.8rem;
  margin-top: 0.2rem;
  color: #ff1744;
  display: none;
}
.form__success input {
  border: 1px solid #00c853;
}
.form__success svg.form__successicon {
  display: block;
}
.form__error input {
  border: 1px solid #ff1744;
}
.form__error svg.form__erroricon {
  display: block;
}
.form__error p.form__message {
  display: block;
}
.form__button {
  outline: none;
  border: none;
  padding: 1rem;
  border-radius: 0.2rem;
  font-family: inherit;
  cursor: pointer;
  background-color: #1f1d2b;
  color: white;
}
!

JS 

              
                const {useState, useEffect, useRef, StrictMode,  ChangeEvent  } = React
const {createRoot, } = ReactDOM

const rootElement = document.getElementById('root')
const root = createRoot(rootElement)

const App =()=>{
    const initialState ={
    email:'',
    password:''
  }
   
  const [formValue, setFormValue] = useState(initialState)
 
   const email = useRef(null)
    const smallsEmail = useRef(null)
    const password = useRef(null)
    const smallsPass = useRef(null)
    const button = useRef(null)
    const handleChange = ({target:{name,value}})=>{
    setFormValue({...formValue, [name]:value})
  }
 const handleBlur = ({target:{name,value}}, input ) =>{
if (input.current.name === 'email') {
    if (!isEmail(input.current.value.trim() )) {
		setErrorFor(input, 'Did not enter a valid email', smallsEmail.current);
	}else {
		setSuccessFor(input);
	}
}
   if (input.current.name === 'password'){
     isPass(input)
   }
    }
  
 const handleSumit = (e)=>{
   	e.preventDefault();
    
    checkInputs()	
   if(isEmail(email.current.value.trim()) && isPass2(password) ){
     const spiner = document.createElement("i")
    spiner.classList.add("fa", "fa-spinner", "fa-spin")
     console.log(spiner)
    button.current.appendChild(spiner) 
     
   setFormValue({
    email:'',
    password:'',
  })
   
    email.current.value ='',
    password.current.value =''
    } 
   }
 
 const handleKeyUp = ({target:{name, value}}, input) =>{

  if (input.current.name === 'email') {
    if (!isEmail(input.current.value.trim() )) {
		setErrorFor(input, 'Did not enter a valid email', smallsEmail.current);
	}else {
		setSuccessFor(input);
	}
}
   if (input.current.name === 'password'){
     isPass(input)
   }
   
   }
 
 function checkInputs() {
	// trim to remove the whitespaces
	
	const emailValue = email.current.value.trim();
	const passwordValue = password.current.value.trim();
	
	if(emailValue === '') {
		setErrorFor(email, 'You cannot leave the email blank', smallsEmail.current);
	} else if (!isEmail(emailValue)) {
		setErrorFor(email, 'Did not enter a valid email', smallsEmail.current);
    return
	} else {
		setSuccessFor(email);
	}
	
	if(passwordValue === '') {
		setErrorFor(password, 'Password must not be entered blank.', smallsPass.current);
    return
	} else {
    isPass(password)
	}

}
  
 function setErrorFor(input, message, small) {
	const formControl = input.current.parentElement;
    formControl.classList.remove("form__success")
	formControl.classList.add("form__error");
	 small.innerHTML = message
}
  
  function isPass(password){
  const isLowerCase = /(?=[a-z])/.test(password.current.value);
  const isUpperCase = /(?=[A-Z])/.test(password.current.value);
    const isNumber = /(?=\d)/.test(password.current.value);
    const isSpecialChar = /(?=\W)/.test(password.current.value);
     const isLongEnough = /.{8,}/.test(password.current.value);
   
     if (!isNumber) {
    	setErrorForPass(password, 'The field must contain numbers', smallsPass.current);
        return
	   } else {
		setSuccessForPass(password);
	}
   if (!isLowerCase) {
    	setErrorForPass(password, 'The field must contain lowercase', smallsPass.current);
        return
	   } else {
		setSuccessForPass(password);
	}
     if (!isUpperCase) {
    	setErrorForPass(password, 'The Field must Contain Capital Letters', smallsPass.current);
       return
	   } else {
		setSuccessForPass(password);
	}
     if (!isSpecialChar) {
    	setErrorForPass(password, 'The field must contain Special characters', smallsPass.current);
        return
	   } else {
		setSuccessForPass(password);
	}
     if (!isLongEnough) {
    	setErrorForPass(password, 'The field must contain more than 8 characters', smallsPass.current);
        return
	   } else {
		setSuccessForPass(password);
	}
}

function setSuccessFor(input) {
	const formControl = input.current.parentElement;
	formControl.classList.remove("form__error");
  formControl.classList.add("form__success");
}
  
function setErrorForPass(input, message, small) {
	const formControl = input.current.parentElement;
  formControl.classList.remove("form__success")
	formControl.classList.add("form__error");
	 small.innerHTML = message
}

function setSuccessForPass(input) {
	const formControl = input.current.parentElement;
	formControl.classList.remove("form__error");
  formControl.classList.add("form__success");
}
  
function isEmail(email) {
	return /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(email);
}
 function isPass2(password) {
   const isLowerCase = /(?=[a-z])/.test(password.current.value);
  const isUpperCase = /(?=[A-Z])/.test(password.current.value);
    const isNumber = /(?=\d)/.test(password.current.value);
    const isSpecialChar = /(?=\W)/.test(password.current.value);
     const isLongEnough = /.{8,}/.test(password.current.value);
   if(!isLowerCase){
     return false
   }
   if(!isUpperCase){
     return 
   }
   if(!isNumber){
     return false
   }
   if(!isSpecialChar){
     return 
   }
   if(!isLongEnough){
     return false 
   }
	return true
} 

  return(
    <div className="container">
    <h2 className="container__header">Login</h2>
    <form action="" className="form" onSubmit={handleSumit}>
      <div className="form__group">
        <label htmlFor="email" className="form__label">Email</label>
        <input 
          type="text" 
          className="form__input form__username" 
          name="email"
          id="username" 
          placeholder="Create a username" 
          autoComplete="off"
           onChange={handleChange}
          onKeyUp={(e)=> handleKeyUp(e, email)}
           onBlur={(e)=> handleBlur(e,email)}
          ref={email}
          
          />
        <svg className="form__successicon" viewBox="0 0 512 512" width="100" title="check-circle">
          <path d="M504 256c0 136.967-111.033 248-248 248S8 392.967 8 256 119.033 8 256 8s248 111.033 248 248zM227.314 387.314l184-184c6.248-6.248 6.248-16.379 0-22.627l-22.627-22.627c-6.248-6.249-16.379-6.249-22.628 0L216 308.118l-70.059-70.059c-6.248-6.248-16.379-6.248-22.628 0l-22.627 22.627c-6.248 6.248-6.248 16.379 0 22.627l104 104c6.249 6.249 16.379 6.249 22.628.001z" />
        </svg>
        <svg className="form__erroricon" viewBox="0 0 512 512" width="100" title="exclamation-circle">
          <path d="M504 256c0 136.997-111.043 248-248 248S8 392.997 8 256C8 119.083 119.043 8 256 8s248 111.083 248 248zm-248 50c-25.405 0-46 20.595-46 46s20.595 46 46 46 46-20.595 46-46-20.595-46-46-46zm-43.673-165.346l7.418 136c.347 6.364 5.609 11.346 11.982 11.346h48.546c6.373 0 11.635-4.982 11.982-11.346l7.418-136c.375-6.874-5.098-12.654-11.982-12.654h-63.383c-6.884 0-12.356 5.78-11.981 12.654z" />
        </svg>
        <p ref = {smallsEmail} className="form__message"></p>
      </div>

      <div className="form__group">
        <label htmlFor="password" className="form__label">Password</label>
        <input 
          type="password" 
          className="form__input form__password" 
          name="password" 
          id="form__password"            
          placeholder="Create a password" 
          ref={password}
           onChange={handleChange}
           onBlur={(e)=>handleBlur(e,password)}
           onKeyUp= {(e)=> handleKeyUp(e, password)}
          autoComplete="off"
          />
        <svg className="form__successicon" viewBox="0 0 512 512" width="100" title="check-circle">
          <path d="M504 256c0 136.967-111.033 248-248 248S8 392.967 8 256 119.033 8 256 8s248 111.033 248 248zM227.314 387.314l184-184c6.248-6.248 6.248-16.379 0-22.627l-22.627-22.627c-6.248-6.249-16.379-6.249-22.628 0L216 308.118l-70.059-70.059c-6.248-6.248-16.379-6.248-22.628 0l-22.627 22.627c-6.248 6.248-6.248 16.379 0 22.627l104 104c6.249 6.249 16.379 6.249 22.628.001z" />
        </svg>
        <svg className="form__erroricon" viewBox="0 0 512 512" width="100" title="exclamation-circle">
          <path d="M504 256c0 136.997-111.043 248-248 248S8 392.997 8 256C8 119.083 119.043 8 256 8s248 111.083 248 248zm-248 50c-25.405 0-46 20.595-46 46s20.595 46 46 46 46-20.595 46-46-20.595-46-46-46zm-43.673-165.346l7.418 136c.347 6.364 5.609 11.346 11.982 11.346h48.546c6.373 0 11.635-4.982 11.982-11.346l7.418-136c.375-6.874-5.098-12.654-11.982-12.654h-63.383c-6.884 0-12.356 5.78-11.981 12.654z" />
        </svg>
        <p ref ={smallsPass} className="form__message"></p>
      </div>

      <button ref={button} className="form__button">Submit  </button>
    </form>
  </div>
  )
}

root.render(
   <StrictMode>
     <App/>
    </StrictMode>
     )
!
999px

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