Form contact avec validation en css

<!DOCTYPE html>
<html>
<head>
    <title>FORM CONTACT AVEC VALIDATION en CSS | Par NGLESSON</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="author" content="Mezgani said">
    <meta name="copyright" content="NGLESSON">
    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> 
    <link href="style.css" rel="stylesheet" type="text/css">	
</head>
<body class="container">
    <div class="row mt-5">
        <form class="contact_form col-lg-6 col-12" action="#" method="post" name="contact_form">
            <ul>
                <li>
                    <h2>Contact Us</h2>
                    <span class="required_notification">* Required input</span>
                </li>
                <li>
                    <label for="name">Name:</label>
                    <input type="text"  placeholder="Name" required />
                </li>
                <li>
                    <label for="email">Email:</label>
                    <input type="email" name="email" placeholder="Email" email required />
                    <span class="form_hint">Proper format "name@something.com"</span>
                </li>
                <li>
                    <label for="website">Website:</label>
                    <input type="url" name="website" placeholder="Website" required pattern="(http|https)://.+"/>
                    <span class="form_hint">Proper format "https://www.nglesson.com"</span>
                </li>
                <li>
                    <label for="message">Message:</label>
                    <textarea name="message" cols="40" rows="6" required ></textarea>
                </li>
                <li>
                    <button class="submit" type="submit">Submit Form</button>
                </li>
            </ul>
        </form>
    </div>
</body>
</html>
/* === Remove input autofocus webkit === */
*:focus {outline: none;}

/* === Form Typography === */
body {font: 14px/21px "Lucida Sans", "Lucida Grande", "Lucida Sans Unicode", sans-serif;}
.contact_form h2, .contact_form label {font-family:Georgia, Times, "Times New Roman", serif;}
.form_hint, .required_notification {font-size: 11px;}

/* === List Styles === */
.contact_form ul {
    width:750px;
    list-style-type:none;
	list-style-position:outside;
	margin:0px;
	padding:0px;
}
.contact_form li{
	padding:12px; 
	border-bottom:1px solid #eee;
	position:relative;
} 
.contact_form li:first-child, .contact_form li:last-child {
	border-bottom:1px solid #777;
}

/* === Form Header === */
.contact_form h2 {
	margin:0;
	display: inline;
}
.required_notification {
	color:#d45252; 
	margin:5px 0 0 0; 
	display:inline;
	float:right;
}

/* === Form Elements === */
.contact_form label {
	width:150px;
	margin-top: 3px;
	display:inline-block;
	float:left;
	padding:3px;
}
.contact_form input {
	height:40px; 
	width:220px; 
	padding:5px 8px;
}
.contact_form textarea {padding:8px; width:300px;}
.contact_form button {margin-left:156px;}

	/* form element visual styles */
	.contact_form input, .contact_form textarea { 
		border:1px solid #aaa;
		box-shadow: 0px 0px 3px #ccc, 0 10px 15px #eee inset;
		border-radius:2px;
		padding-right:30px;
		-moz-transition: padding .25s; 
		-webkit-transition: padding .25s; 
		-o-transition: padding .25s;
		transition: padding .25s;
	}
	.contact_form input:focus, .contact_form textarea:focus {
		background: #fff; 
		border:1px solid #555; 
		box-shadow: 0 0 3px #aaa; 
		padding-right:70px;
	}

/* === HTML5 validation styles === */	
.contact_form input:required, .contact_form textarea:required {
	background: #fff url(red_asterisk.png) no-repeat 98% center;
}
.contact_form input:required:valid, .contact_form textarea:required:valid {
	background: #fff url(valid.png) no-repeat 98% center;
	box-shadow: 0 0 5px #5cd053;
	border-color: #28921f;
}
.contact_form input:focus:invalid, .contact_form textarea:focus:invalid {
	background: #fff url(invalid.png) no-repeat 98% center;
	box-shadow: 0 0 5px #d45252;
	border-color: #b03535
}

/* === Form hints === */
.form_hint {
	background: #d45252;
	border-radius: 3px 3px 3px 3px;
	color: white;
	margin-left:8px;
	padding: 1px 6px;
	z-index: 999; /* hints stay above all other elements */
	position: absolute; /* allows proper formatting if hint is two lines */
	display: none;
}
.form_hint::before {
	content: "\25C0";
	color:#d45252;
	position: absolute;
	top:1px;
	left:-6px;
}
.contact_form input:focus + .form_hint {display: inline;}
.contact_form input:required:valid + .form_hint {background: #28921f;}
.contact_form input:required:valid + .form_hint::before {color:#28921f;}
	
/* === Button Style === */
button.submit {
	background-color: #68b12f;
	background: -webkit-gradient(linear, left top, left bottom, from(#68b12f), to(#50911e));
	background: -webkit-linear-gradient(top, #68b12f, #50911e);
	background: -moz-linear-gradient(top, #68b12f, #50911e);
	background: -ms-linear-gradient(top, #68b12f, #50911e);
	background: -o-linear-gradient(top, #68b12f, #50911e);
	background: linear-gradient(top, #68b12f, #50911e);
	border: 1px solid #509111;
	border-bottom: 1px solid #5b992b;
	border-radius: 3px;
	-webkit-border-radius: 3px;
	-moz-border-radius: 3px;
	-ms-border-radius: 3px;
	-o-border-radius: 3px;
	box-shadow: inset 0 1px 0 0 #9fd574;
	-webkit-box-shadow: 0 1px 0 0 #9fd574 inset ;
	-moz-box-shadow: 0 1px 0 0 #9fd574 inset;
	-ms-box-shadow: 0 1px 0 0 #9fd574 inset;
	-o-box-shadow: 0 1px 0 0 #9fd574 inset;
	color: white;
	font-weight: bold;
	padding: 6px 20px;
	text-align: center;
	text-shadow: 0 -1px 0 #396715;
}
button.submit:hover {
	opacity:.85;
	cursor: pointer; 
}
button.submit:active {
	border: 1px solid #20911e;
	box-shadow: 0 0 10px 5px #356b0b inset; 
	-webkit-box-shadow:0 0 10px 5px #356b0b inset ;
	-moz-box-shadow: 0 0 10px 5px #356b0b inset;
	-ms-box-shadow: 0 0 10px 5px #356b0b inset;
	-o-box-shadow: 0 0 10px 5px #356b0b inset;
	
}

                                    
Ajouter une pagination1

Ajouter une pagination1

Background div gradient

Background div gradient

Bootstrap4 datepicker

Bootstrap4 datepicker

Buttons Styles Inspirations

Buttons Styles Inspirations

Calculatrice style01

Calculatrice style01

Carousel 6 Column Product Slider with B4

Carousel 6 Column Product Slider with B4

Créer un effet de défilement vers le bas de la souris animé

Créer un effet de défilement vers le bas de la souris animé

Image hover Inspiration styles

Image hover Inspiration styles

Input range slider HTML style01

Input range slider HTML style01

Loading style book loader

Loading style book loader

Profile page with b4

Profile page with b4

Timeline style06

Timeline style06