What is the most effective method to make a div span the entire width of the page?

My webpage has a header at the top and here is the HTML code:

<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<css link here>
</head>


<body onload="prettyPrint()">
<div class="header">
</div>
</body>
</html>

Here is the CSS:

body
{
    background-color: rgb(200, 200, 200);
    z-index: 0;
    margin-top: 50px; 
}

.header
{
    width: 100%;
    background-color: rgb(8, 36, 86); 
    color: white;
    height: 2em; 
    padding: .5em;  
    z-index: 1000; 
    top: 0px;
    position: fixed;
    font-family: times, serif; 
    display: inline-block;
}

However, when I run this code, the header does not extend across the page correctly as expected in both Chrome and Firefox:

I tried setting the width of the header to 1000% and adding a left margin of -9999px in the CSS, but it seems like a workaround. Is there a better solution to make the header extend across the page without any issues?

Answer №1

It's common for the html and body elements to have margins and paddings set to values other than zero. Ensure that your html and body elements include the following CSS:

html, body {
    width:100%;
    margin:0;
    padding:0;
}

Answer №2

Utilize Viewport units: vw, vh, vmin, vmax along with box-sizing

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
  margin:0;padding:0;
}
.body{
  width: 100vw;
  height: 100vh;
  background-color: rgb(200, 200, 200);
  z-index: 0;
  margin-top: 50px; 
}

Answer №3

To make any element stretch across the entire page, simply apply the following css property:

width: 100%

Answer №4

Web browsers come with default styles for their HTML tags, like how the body tag has a margin of 8px in my Firefox browser. To override these defaults, you need to explicitly define new styles.

Creating a reset CSS is essential to ensure consistency across different browsers. This way, you can set all the default values you want to achieve a unique design.

Many frameworks, such as Bootstrap, already include a built-in reset CSS.

body {
    background-color: rgb(200, 200, 200);
    z-index: 0;
    margin: 0;
}
/* */
.header {
    width: 100%;
    background-color: rgb(8, 36, 86); 
    color: white;
    height: 2em; 
    padding: .5em;  
    font-family: times, serif; 
}

Answer №5

To begin creating a CSS, it is important to remember that each browser has its own default margin and padding settings. In order to ensure consistency, the first step is to reset all elements to have no margin or padding by applying the following code:

*{padding:0; margin:0;}

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