How to Get Rid of Margin Around My HTML Content

How can I get rid of margin around my HTML content?

You could add CSS to the document....

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Hello</title>
    <style type="text/css">
    body { margin:0; }
    </style>
</head>
<body>
    <div style="width: 100px; height: 100px; background: red;">
        <div>Hello</div>
    </div>
</body>

Or you could add the CSS as an inline style

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Hello</title>
</head>
<body style="margin:0;">
    <div style="width: 100px; height: 100px; background: red;">
        <div>Hello</div>
    </div>
</body>
</html>

All browsers have a default margin around the top and left edge of the window. There's nothing wrong with your page. You merely need to tell the browser to remove the default margins.

Removing body margin in CSS

I would say that using:

* {
  margin: 0;
  padding: 0;
}

is a bad way of solving this.

The reason for the h1 margin popping out of the parent is that the parent does not have a padding.

If you add a padding to the parent element of the h1, the margin will be inside the parent.

Resetting all paddings and margins to 0 can cause a lot of side effects. Then it's better to remove margin-top for this specific headline.

How to remove margin space around body or clear default css styles

body has by default 8px margins: http://www.w3.org/TR/CSS2/sample.html

body { 
    margin: 0;   /* Remove body margins */
}

Or you could use this useful Global reset

*,
*::before,
*::after { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
}

If you want something less * global:

html, body, body div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, abbr, address, cite, code, del, dfn, em, img, ins, kbd, q, samp, small, strong, sub, sup, var, b, i, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, figure, footer, header, hgroup, menu, nav, section, time, mark, audio, video {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    font-size: 100%;
    vertical-align: baseline;
    background: transparent;
}

some other CSS Reset:

http://meyerweb.com/eric/tools/css/reset/

https://github.com/necolas/normalize.css/

http://html5doctor.com/html-5-reset-stylesheet/

…

How do I remove the top margin in a web page?

I had similar problem, got this resolved by the following CSS:

body {    
    margin: 0 !important;
    padding: 0 !important;
}

Removing the white margin around my image

Try this, And put your div in the <body>

* {  margin: 0;  padding: 0;}
.image {  width: 100%;  height: auto;}

<body>  <div>    <img class="image" src="G:\Pics\1.jpg">  </div></body>