What does decide length of container?

[netninja25253]

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https://www.codecademy.com/courses/web-ext/projects/html-css-prj_innovation-cloud

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What does decide length(height) of container in the header?
Does it automatically set up by this code?

.header .container {
  position:relative;

``` html, body { margin: 0; padding: 0; }

body {
font-family: ‘Roboto’, sans-serif;
font-weight: 100;
}

.container {
margin: 0 auto;
max-width: 940px;
}

/* Header */
.header {
background:url(“https://s3.amazonaws.com/codecademy-content/projects/innovation-cloud/bg.jpg”) center center / cover no-repeat;
height:800px;
text-align:center;
}

.header .container {
position:relative;
top:200px;
}

.container {
margin:0 auto;
max-width:940px;
padding:0 10px;
}

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[stetim94]

if you don’t set a width and height, the width and height are auto, so they expand if more space is required (elements inside the div, like heading and paragraphs)

[netninja25253]

Thank you for reply!