How to remove the margin at the top of my page

Tags: html,css,html5,css3,margin

Problem :

I want to delete the margin top of my page. I will show you what I mean with a screenshotenter image description here

You can see in my pic there are a red arrow that indicate my problem. How I can delete this margin? I post here my css:

div#header {
    background-color: #6495ED;
    background: -moz-linear-gradient(100% 100% 90deg, black, gray);
    background: -webkit-gradient(linear, center top, center bottom, from(gray), to(black));
    margin: 0px;
    width: 100%;
body {
    background-color: #000000;
    width: 100%;
    height: 100%;
    padding: 0;
    margin: 0;
h1 {
    text-align: center;
    color: #FFFFFF;
    font-family:  sans-serif;
    font-size: 26px;
    font-weight: bold;
    padding: 5px;
ul {
    list-style-type: none;
    padding: 5px;

li {
    color: #FFFFFF;
    font-family: sans-serif;

p {
    color: #FFFFFF;
    font-family: sans-serif;
    padding: 5px;
a {
    text-decoration: none;
    color: #FFFFFF;

So any suggestion about how I can delete this margin just above my header?

Here you can see my html:

<!DOCTYPE html>
<html lang="it">
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/>  
        <title>Lista coupon</title>
        <script src="../js/jquery-1.9.1.min.js" type="text/javascript"></script>
        <script src="../js/memoria.js"          type="text/javascript"></script>
        <style  src="../css/style.css"          type="text/css"></style>
    <body onload="loadJson();">
        <div id="header">
            <h1>Lista coupon salvati</h1>
        <div id="content">
            <p>Di seguito trovi tutte le promozioni salvate</p>
            <div id="list">
        <div id="footer">


Solution :

Set margin: 0; to <h1> element


Same problem as with the margin-left of <ul> elements, or margin-top / margin-bottom of <p> elements, etc.

You need to reset their default styles when using them at the borders of your page.

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