Muundo wa Tovuti yenye Safu Tatu katika CSS

Hebu sasa tufanye muundo wa safu tatu. Hapa kuna mfano wa kile tunachopaswa kupata:

Kwanza tuandike muundo wa tovuti:

<div id="wrapper">
	<div id="header">
		kichwa
	</div>
	<div id="container">
		<div id="left">
			upau wa kushoto
		</div>
		<div id="content">
			maudhui
		</div>
		<div id="right">
			upau wa kulia
		</div>
	</div>
	<div id="footer">
		kiwambo
	</div>
</div>

Tuweke upana wa kifurushi na tukikatie katikati:

#wrapper {
	width: 1100px;
	margin: 30px auto;
	border: 1px solid black;
}

Tuweke vitalu vya chombo kwa mstari mmoja:

#container {
	display: flex;
}

Sasa tupeana upana wa vitalu ili kwa jumla wape upana wa kifurushi:

#content {
	width: 700px;
}
#left {
	width: 200px;
}
#right {
	width: 200px;
}

Hebu sasa tuongeze margin, tukiondoa upana wao kutoka kwa maudhui:

#content {
	width: 660px;
}
#left {
	width: 200px;
	margin-right: 20px;
}
#right {
	width: 200px;
	margin-left: 20px;
}

Tuongeze mitindo mingine:

#content {
	width: 660px;
	height: 700px;
	padding: 20px;
	border: 1px solid black;
}
#left {
	width: 200px;
	margin-right: 20px;
	padding: 20px;
	border: 1px solid black;
}
#right {
	width: 200px;
	margin-left: 20px;
	padding: 20px;
	border: 1px solid black;
}

Tuandike msimbo wa mwisho:

<div id="wrapper">
	<div id="header">
		kichwa
	</div>
	<div id="container">
		<div id="left">
			upau wa kushoto
		</div>
		<div id="content">
			maudhui
		</div>
		<div id="right">
			upau wa kulia
		</div>
	</div>
	<div id="footer">
		kiwambo
	</div>
</div>

* {
	box-sizing: border-box;
}

#wrapper {
	width: 1100px;
	margin: 30px auto;
	border: 1px solid black;
}
#header {
	height: 200px;
	padding: 20px;
	border: 1px solid black;
}
#container {
	display: flex;
}
#content {
	width: 660px;
	height: 700px;
	padding: 20px;
	border: 1px solid black;
}
#left {
	width: 200px;
	margin-right: 20px;
	padding: 20px;
	border: 1px solid black;
}
#right {
	width: 200px;
	margin-left: 20px;
	padding: 20px;
	border: 1px solid black;
}
#footer {
	height: 200px;
	padding: 20px;
	border: 1px solid black;
}