Bonjour
je cherche a positionner plusieurs div les un par rapport au autre comme dans l'exemple de la fenêtre de chat de facebook quand vous ouvrer une nouvelle fenêtre elle se met a coté de la première automatiquement
je veux que a partir du deuxième div avec la class .main-chat il ajoute la largeur de son précédent a sa margin d'ou la formul calc()
voici le
Code HTML : Sélectionner tout - Visualiser dans une fenêtre à part
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<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>FBlike</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0-2/js/all.min.js"></script>
	<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
	<link rel="stylesheet" href="style.css">
</head>
<body>
 
	<div class="main" id="app">
		<div class="navbar">
			<div class="nav-bar-elements container">
				<div class="nav-bar-left-side">
					<div class="icon-home">
						<i class="fab fa-facebook-square"></i>	
					</div>
					<input type="text" class="search searchinput" placeholder=" Rechercher">
					<div class="btn search">
						<i class="fas fa-search"></i>
					</div>
				</div>
				<div class="nav-bar-right-side">
					<div class="icon-avatar">
		<img src="https://picsum.photos/23/23?random">
					</div>
					<a href="" class="lien">Bedji</a>
					<a href="" class="lien">Acceuil</a>
					<a href="" class="lien">Créer</a>
					<a href="" class="icon-button"><i class="fas fa-user-friends"></i></a>
					<a href="" class="icon-button"><i class="fab fa-facebook-messenger"></i></a>
					<a href="" class="icon-button"><i class="fas fa-bell"></i></a>
					<a href="" class="icon-button"><i class="fas fa-question-circle"></i></a>
					<a href="" class="icon-button"><i class="fas fa-caret-down"></i></a>
 
 
				</div>
 
			</div>
		</div>
		<div class="left-column container">
		<div class="member-id ">
 
				<img src="https://picsum.photos/23/23?random" alt="">
				<h4>Bedji Badrou</h4>
 
			</div>
			<div class="onglet active"><a href="" class="lien-left"><i class="far fa-newspaper"></i>Fil d'actualité</a></div>
 
			<onglet v-for="(item , id) in onglets"  :key="item.id"> </onglet>
 
			<div  class="onglet"><a href="" class="lien-left"><i class="fab fa-facebook-messenger"></i>Messenger</a></div>
 
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-tv"></i>Watch</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-store"></i>Marketplace</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-mosque"></i>Place</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-archway"></i>Paris</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-road"></i>Road</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-torii-gate"></i>Tours</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-campground"></i>Other</a></div>
			<div class="onglet"><a href="" class="lien-left"><i class="fas fa-dungeon"></i>Archives</a></div>
 
 
 
		</div>
		<div class="feed-column container">
 
			<div class="new-post">
					<div class="new-post-header">
						<div class="icon-avatar">
							<img src="https://picsum.photos/23/23?random=1">
						</div>
						<h4 class="id-name">nom d'utilisateur</h4>
						<div class="post-date">date:heure</div>
							<i class="fas fa-globe-africa"></i>
					</div>
 
					<p>
						{{message}}
					</p><img src="https://picsum.photos/500/300?random=2" alt="">
					<div class="button-side">
					<div class="button">
						<i class="far fa-thumbs-up"></i> Like
					</div>
					<div class="button">
						<i class="far fa-comment-alt"></i>Commenter
					</div>
					<div class="button">
						<i class="fas fa-share"></i> Partager 
					</div>	
					</div>
 
					<div class="comment-side">
						<div class="icon-avatar">
						<img src="https://picsum.photos/23/23?random">
					</div>
					<input type="text" class="comment">
					</div>
 
			</div>
			<div class="new-post">
					<div class="new-post-header">
						<div class="icon-avatar">
							<img src="https://picsum.photos/23/23?random=1">
						</div>
						<h4 class="id-name">nom d'utilisateur</h4>
						<div class="post-date">date:heure</div>
							<i class="fas fa-globe-africa"></i>
					</div>
					<p>{{ message }}</p><img src="https://picsum.photos/500/300?random=3" alt="">
					<div class="button-side">
					<div class="button">
						<i class="far fa-thumbs-up"></i> Like
					</div>
					<div class="button">
						<i class="far fa-comment-alt"></i>Commenter
					</div>
					<div class="button">
						<i class="fas fa-share"></i> Partager 
					</div>
					</div>
					<div class="comment-side">
					<div class="icon-avatar">
						<img src="https://picsum.photos/23/23?random">
					</div>
					<input type="text" class="comment">
				</div>
			</div>
 
 
		</div>
		<div class="footer-bloc ">
			<div class="footer-langages">
				<div class="langes">
				<a href="#" class="choisi">Francais (France)</a> 
				 <a href="#" class="">English (US) </a>  
				 <a href="#" class="">Espanol (Brasil)</a> 
				 <a href="#" class="">Deutsh (Allmagne)</a>	
				</div>
 
				<button>+</button>
			</div>
			<div class="footer-legal">
				 <a href="#">Confidentialité </a>
				 <a href="#">Conditions génerales</a>
				 <a href="#">publicité</a>
				 <a href="#">Choisir sa pub</a>
				 <a href="#">Cookies</a>
				 <a href="#" >Facebook @ 2020</a>
			</div>
		</div>
		<div class="contact-column" >
 
			<div v-for="user in contacts" :key="user.id" class="onglet-contact"><img :src="user.imgUrl" alt="" class="icon-avatar"><span :class="{enligne:user.enligne}">{{user.firstName}} {{user.lastName}}</span></div>
			<!-- <onglet-contact></onglet-contact> -->
 
 
			<div class="onglet-contact"><img src="https://picsum.photos/30/30?random=13" alt="" class="icon-avatar"><span class="enligne">Nom contact</span></div>
		</div>
 
 
	<div class="chat-main">
	<div class="chat-header">
		<div class="info-contact">
				<div class="icon-avatar"><img src="https://picsum.photos/32" alt=""></div>
					<h2 class="username">Nom contact</h2>
					<span class="contact-status">en ligne</span>
				</div>
		<div class="button-interaction">
				<i class="fas fa-video"></i>
				<i class="fas fa-phone"></i>
				<i class="fas fa-cog"></i>
				<i class="fas fa-times"></i>
		</div>								
	</div>	
		<div class="chat-message">
			<div class="msg-recive">
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illo, animi!</p>
			</div>
			<div class="msg-sent">
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. </p>
			</div>
			<div class="msg-recive">
				<p>Numquam dolore sed perferendis, odit. Porro illo nemo expedita quae!</p>
			</div>
			<div class="msg-sent">
				<p>Dignissimos sunt, vitae iusto beatae eius nostrum, autem tempora ?</p>
			</div>
		</div>
		<div class="chat-input">
			<input type="text" placeholder="Enter votre message">
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
		</div>
	</div>
<!-- chat 2 -->
	<div v-if="chatvisible" class="chat-main">
	<div class="chat-header">
		<div class="info-contact">
				<div class="icon-avatar"><img src="https://picsum.photos/32" alt=""></div>
					<h2 class="username">Nom contact</h2>
					<span class="contact-status">en ligne</span>
				</div>
		<div class="button-interaction">
				<i class="fas fa-video"></i>
				<i class="fas fa-phone"></i>
				<i class="fas fa-cog"></i>
				<i @click="closechat" class="fas fa-times"></i>
		</div>								
	</div>	
		<div class="chat-message">
			<div class="msg-recive">
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illo, animi!</p>
			</div>
			<div class="msg-sent">
				<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. </p>
			</div>
			<div class="msg-recive">
				<p>Numquam dolore sed perferendis, odit. Porro illo nemo expedita quae!</p>
			</div>
			<div class="msg-sent">
				<p>Dignissimos sunt, vitae iusto beatae eius nostrum, autem tempora ?</p>
			</div>
		</div>
		<div class="chat-input">
			<input type="text" placeholder="Entez votre message">
			<div class="chat-input-button">
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			<i class="fas fa-phone"></i>
			</div>
 
		</div>
	</div>
 
<!-- <chat-main></chat-main> -->
 
</div>
 
 
	<script src="app.js"></script>
</body>
</html>

voici le code css que j'ai utilisé
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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body{
	--chat-width:280px;
	--chat-right:55px;
	width:  
	box-sizing: border-box;
	padding:0;
	margin:0;
	background: #e9ebee;
	font-family: sans-serif;
}
.container {
	width: 1014px;
margin-left: 60px;
}
.navbar{
	height: 43px;
	background:#4267b2;
	position: fixed;
	z-index: 10;
	width: 100vw;
	top: 0;
}
.nav-bar-elements{
	justify-content: flex-start;
	align-content: center;
	display: flex;
	}
.nav-bar-left-side{
	/*padding: 10px 20px;*/
	display: flex;
	margin-right: auto;
}
.icon-home{
	color: white;
	font-size: 30px;
	margin: 5px 6px 5px 0px;
 
}
.icon-avatar img{
	border-radius: 50%;
}
.searchinput{
	height: 21px;
	margin: 10px auto;
	width: 400px;
	outline: none;
	border: #abadb3;
	border-bottom-left-radius: 2px;
	border-top-left-radius: 2px; 
}
 .btn{
 	background-color: #f5f6f7;
 	padding: 2px;
	height: 19px;
	margin: 10px auto;
	width: 45px;
	color: #4e5665;
	border-bottom-right-radius: 2px;
	border-top-right-radius: 2px; 
	text-align: center;
}
.nav-bar-right-side{
	justify-content: space-between;
	padding: 10px 0px;
	display: flex;
}
.nav-bar-right-side a{
	padding: 3px 10px;
	color: #fff;
	font-size: 13px;
	font-weight: bold;
	text-decoration: none;
}
.nav-bar-right-side .icon-button {
color: #1a2947;
font-size: 20px;
padding: 0px 9px;
	}
.nav-bar-right-side .icon-button:nth-child(3n+1)::after {
	content: '';
border-right: 1px #3b5ca0 solid;
padding-left: 10px;
}		
.nav-bar-right-side .lien {
 
padding-right: 4px ;
	}
	.nav-bar-right-side .lien::after {
 
content: '';
border-right: 1px #3b5ca0 solid;
padding-left: 10px;
	}
.left-column{
	padding: 5px 6px 5px 0;
	display: flex;
	flex-direction: column;
	width: 200px;
	font-size: 15px;
	height: 100vh;
	position: fixed;
top: 43px;
z-index: 9;
}
.member-id{
 
	display: flex;
	}
.member-id h4{
margin: 0;
font-weight: 200;
padding: 10px 5px 10px 0;
	}
.member-id img {
	margin-right:  5px;
	padding: 10px 0px 10px 0;
	border-radius: 50%;
	height: 23px;
	width:23px;
}
.active {
	border: 1px solid #e0e2e5;
	background-color: #f5f6f7;
	font-weight: bold;
	border-radius: 2px;
}
.onglet{
	padding: 5px 10px 5px 3px;
}
.onglet a{
	font-size: 13px;
	color: #000;
	text-decoration: none;
}
.onglet .svg-inline--fa{
	color: #01a4ff;
	margin-right:  5px;
	font-size: 18px;
}
.onglet:hover{
	background-color: #f5f6f7;
}
.feed-column{
	 margin-top: 43px; 
}
.new-post{
 
	margin-left: 210px;
	width: 500px;
	background: #fff;
	border:
	border: 1px solid #e0e2e5;
	border-radius: 2px; 
	margin-bottom: 13px; 
}
.new-post-header{
	padding: 9px 9px 0 9px;
	display: flex;
 
}
.new-post-header .icon-avatar img{
	width: 40px;
	height:40px;
}
.new-post-header h4{
	font-size: 15px;
	margin: 0;
	padding-left: 10px;
	color: #4267b2;
}
.new-post-header .post-date{
	align-self: flex-end;
	margin-left: -118px;
	font-size: 13px;
	color: #616770;
}
.new-post-header .svg-inline--fa{
	align-self: flex-end;
	padding-left: 10px;
	font-size: 13px;
	color: #616770;
 
}
.new-post p{
	padding: 0 10px;
}
.button-side{
	display: flex;
}
.button-side .button{
	box-sizing: border-box;
	width: 33%;
	display: block;
	text-align:  center;
	padding: 10px 0;
	color:#616770;
	cursor: pointer;
}
.button-side .svg-inline--fa{
	margin-right: 10px;
	font-size: 19px;
}
.comment{
	margin: 0 5px;
	background-color: #f2f3f5;
	height: 20px;
	padding: 5px;
	flex: 1;
	outline: none;
	border: 1px solid #d6d9dd;
	border-radius: 20px;
 
}
.comment-side{
	padding: 10px 0;
	align-content: center;
	justify-content: center;
	display: flex;
}
.comment-side img{
width: 30px;
margin-left: 9px;
}
.footer-bloc{
position: fixed;
top:63px;
left:785px;
width: 290px;
}
.footer-langages{
	padding: 15px;
	position: relative;
	display:flex; 
	border: 1px solid #e0e2e5;
	background-color: #fff;
	border-radius: 2px;
}
.footer-langages a{
	padding:0 5px;
	font-size: 13px;
	text-decoration: none;
	color: #4267b2;
}
.footer-langages a::after{
	content: ' . ';
}
a.choisi {
	text-decoration: none;
	color: #9197a3;
}
.footer-langages button{
	height: 30px;
	align-self: center;
	font-weight: 400;
	font-size: 20px;
	line-height :0px;
}
.footer-legal {
	font-size: 13px;
	padding: 10px 13px;
	display: inline-block;
}
.footer-legal a{
	color: #000;
	opacity: 0.4;
	text-decoration: none;
	font-weight: 500;
}
.footer-legal a:last-child {
	opacity: .7;
}
.footer-legal a::after{
	content: ' . ';
}
.contact-column{
	height: 100vh;
	position: fixed;
	right: 0;
	top: 43px;
 
	border-left: 1px ridge #d6d9dd;
}
.onglet-contact{
 
	display: flex;
	padding: 5px 10px ;
	align-content: center;
	transition: .6s;	
}
.onglet-contact:hover{
cursor: pointer;
background-color: #fff;
 
}
.onglet-contact img{
	border-radius: 50%;
}
.onglet-contact span{
	padding: 5px 5px;
font-size: 13px;
opacity: .7;
}
  span.enligne::after  {
	display: inline-block;
	content: '';
	width: 6px;
	height:6px;
	background-color: #42b72a;
	border-radius: 3px;
    margin-left: 50px;
}
 
.chat-main{
	background-color: #fff;
	position: fixed;
	bottom: 0;
	right:var(--chat-right) ;
	width: var(--chat-width);
	border-top-left-radius: 12px;
	border-top-right-radius: 12px;
	box-shadow: 0px 0px 5px 0px #8b8c8e;
	font-size: 12px;
}
.chat-main:nth-child(n+2) {
 
	--new-chat-right:calc(var(--chat-right) + var( --chat-width)); ;
	right: var(--new-chat-right);
	width: var(--chat-width);
 
}
/*.chat-main:nth-child(n+2){
	width: var(--chat-width);
	right:calc(var(--chat-right) + var( --chat-width));
}*/
.chat-header{
	padding: 10px 10px 2px 10px;
	display: flex;
	justify-content: space-between;
	border-bottom: 2px solid #e5e5e5;
}
.info-contact{
	display: flex;
	justify-content: flex-start;
}
.chat-header .username{
	font-size: 13px;
	padding: 1px 5px;
	margin: 1px 2px;
}
.contact-status{
	align-self: flex-end;
	color: #a497c1;
	left: 50px;
	position: absolute;
	top: 27px;
}
.button-interaction{
	color: #000;
	font-size: 18px;
	padding: 5px 5px;
	opacity: .3;
}
.button-interaction .svg-inline--fa{
	padding: 0 3px;
}
.chat-message{
	 overflow:scroll;
	overflow-x:hidden;
	height: 225px;
	border-bottom: 1px solid #e5e5e5;
}
.msg-recive{
	margin: 5px auto 9px 5px;
	background-color: #f1f0f0;
	padding: 1px 10px;
	border-radius: 15px;
	width: 70%;
}
.msg-sent{
 	margin: 5px 5px 9px auto;
	color: #fff;
	background-color: #0099ff;
	padding: 1px 10px;
	border-radius: 15px;
	width: 70%;
}
 
.chat-input{
	display: flex;
	flex-direction: column;
	}
.chat-input input{
	width: inherit;
	flex-grow: 0;
	padding: 8px 5px;
	outline: none;
	border: none;
}
.chat-input-button{
display: flex;
justify-content:space-evenly;
padding: 5px;
font-size: 20px;
opacity: .3;
}
et voici la partie qui pose probleme
Code : Sélectionner tout - Visualiser dans une fenêtre à part
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body{
--chat-width:280px;
--chat-right:55px;
}
.chat-main{
	background-color: #fff;
	 position: fixed;
	 bottom: 0;
	right:var(--chat-right) ;
	width: var(--chat-width);
	border-top-left-radius: 12px;
	border-top-right-radius: 12px;
	box-shadow: 0px 0px 5px 0px #8b8c8e;
	font-size: 12px;
}
.chat-main:first-child {
	right: calc(var(--chat-right) + 190px);
	width: var(--chat-width);
}
.chat-main:nth-child(n+2){
	width: var(--chat-width);
	right:calc(var(--chat-right) + var( --chat-width));
}
le problème c'est que les fenêtres se mettent les un sur les autres
es-ce que j'ai mal utilisé calc ou c'est nth-child qui coince ?

Nom : Screenshot_2020-06-10 FBlike.png Affichages : 130 Taille : 235,3 Ko

merci d'avance