CSSda saytning uch ustunli maket sxemasi

Keling, endi uch ustunli maket yasaymiz. Mana bizga nima natija qilish kerakligi misoli:

Boshlanish uchun sayt strukturini yozamiz:

<div id="wrapper">
	<div id="header">
		header
	</div>
	<div id="container">
		<div id="left">
			left sidebar
		</div>
		<div id="content">
			content
		</div>
		<div id="right">
			right sidebar
		</div>
	</div>
	<div id="footer">
		footer
	</div>
</div>

Wrapper'ning kengligini belgilaymiz va uni markazga joylashtiramiz:

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

Konteyner bloklarini qatorga joylashtiramiz:

#container {
	display: flex;
}

Endi bloklarning kengliklarini shunday belgilaymizki, ular yig'indisi wrapper kengligini bersin:

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

Keling, endi marginlarni qo'shamiz, ularning kengligini kontentdan ayirib olgan holda:

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

Qolgan uslublarni qo'shamiz:

#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;
}

Yakuniy kodni yozamiz:

<div id="wrapper">
	<div id="header">
		header
	</div>
	<div id="container">
		<div id="left">
			left sidebar
		</div>
		<div id="content">
			content
		</div>
		<div id="right">
			right sidebar
		</div>
	</div>
	<div id="footer">
		footer
	</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;
}