Adjusting the body element's width and background hue

My goal is to adjust the background for the body element. Although I have modified the width of body, I anticipated the background to align with this width, yet it is expanding to fill the entire screen. How can I rectify this issue?

body {
border: 1px solid black;
width: 500px;
margin: 0 auto;
background: black;
}

Answer №1

When setting the background color for the html element, it's important to note that if you don't specify a color, the browser will default to using the background color of the body element instead. This may result in not seeing the intended difference.

To resolve this issue, simply assign a different background color to the html element and also ensure that the body element has a specified height:

html {
    background-color: blue;     /* new */
}

body {
    border: 1px solid red;
    width: 600px;
    height: 600px;              /* new */
    margin: 0 auto;
    background: white;
}


Exploring the connection between html, body, and background-color.

The default background-color value for all elements is set to transparent.

If no specific background-color is defined for the html element (i.e., remains transparent), then according to CSS rules, the browser will inherit the background-color from the body element.

As stated in the specifications:

3.11.2. The Canvas Background and the HTML <body> Element

In documents where the root element is an HTML HTML element or an XHTML html element: If the computed value of background-image on the root element is none and its background-color is transparent, browsers are required to adopt the computed values of the background properties from the first HTML BODY or XHTML body child element. The initial values of these BODY element's background properties are used, and the inherited values are treated as if they were initially specified on the root element. Authors of HTML documents are advised to define the canvas background for the BODY element rather than the HTML element.

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