Gap around div tag

Question

Hello Dreamweavers.
Ive made a div tag and Ive centered it in the middle of my page. But on the top there is a gap.
Ive seen some articles where it says to add:
margin: 0;
padding: 0;
Im doing so, but im still getting that gap on the top.
this is my CSS
#box1 {
          background-color: #00F;
          height: 200px;
          width: 600px;
          padding: 0px;
          margin: auto;
I have margin to Auto in order to center the box, is this correct?, there for I add the 0 padding in order to get rid of the gap.

Answer 1

You could try adding the following to the top of the CSS
    margin: 0;
    padding: 0;
or better still, add a normalise script as in
/*! normalize.css v1.1.1 | MIT License | git.io/normalize */
/* ==========================================================================
   HTML5 display definitions
   ========================================================================== */
* Correct `block` display not defined in IE 6/7/8/9 and Firefox 3.
article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
    display: block;
* Correct `inline-block` display not defined in IE 6/7/8/9 and Firefox 3.
audio,
canvas,
video {
    display: inline-block;
    *display: inline;
    *zoom: 1;
* Prevent modern browsers from displaying `audio` without controls.
* Remove excess height in iOS 5 devices.
audio:not([controls]) {
    display: none;
    height: 0;
* Address styling not present in IE 7/8/9, Firefox 3, and Safari 4.
* Known issue: no IE 6 support.
[hidden] {
    display: none;
/* ==========================================================================
   Base
   ========================================================================== */
* 1. Prevent system color scheme's background color being used in Firefox, IE,
*    and Opera.
* 2. Prevent system color scheme's text color being used in Firefox, IE, and
*    Opera.
* 3. Correct text resizing oddly in IE 6/7 when body `font-size` is set using
*    `em` units.
* 4. Prevent iOS text size adjust after orientation change, without disabling
*    user zoom.
html {
    background: #fff; /* 1 */
    color: #000; /* 2 */
    font-size: 100%; /* 3 */
    -webkit-text-size-adjust: 100%; /* 4 */
    -ms-text-size-adjust: 100%; /* 4 */
* Address `font-family` inconsistency between `textarea` and other form
* elements.
html,
button,
input,
select,
textarea {
    font-family: sans-serif;
* Address margins handled incorrectly in IE 6/7.
body {
    margin: 0;
/* ==========================================================================
   Links
   ========================================================================== */
* Address `outline` inconsistency between Chrome and other browsers.
a:focus {
    outline: thin dotted;
* Improve readability when focused and also mouse hovered in all browsers.
a:active,
a:hover {
    outline: 0;
/* ==========================================================================
   Typography
   ========================================================================== */
* Address font sizes and margins set differently in IE 6/7.
* Address font sizes within `section` and `article` in Firefox 4+, Safari 5,
* and Chrome.
h1 {
    font-size: 2em;
    margin: 0.67em 0;
h2 {
    font-size: 1.5em;
    margin: 0.83em 0;
h3 {
    font-size: 1.17em;
    margin: 1em 0;
h4 {
    font-size: 1em;
    margin: 1.33em 0;
h5 {
    font-size: 0.83em;
    margin: 1.67em 0;
h6 {
    font-size: 0.67em;
    margin: 2.33em 0;
* Address styling not present in IE 7/8/9, Safari 5, and Chrome.
abbr[title] {
    border-bottom: 1px dotted;
* Address style set to `bolder` in Firefox 3+, Safari 4/5, and Chrome.
b,
strong {
    font-weight: bold;
blockquote {
    margin: 1em 40px;
* Address styling not present in Safari 5 and Chrome.
dfn {
    font-style: italic;
* Address differences between Firefox and other browsers.
* Known issue: no IE 6/7 normalization.
hr {
    -moz-box-sizing: content-box;
    box-sizing: content-box;
    height: 0;
* Address styling not present in IE 6/7/8/9.
mark {
    background: #ff0;
    color: #000;
* Address margins set differently in IE 6/7.
p,
pre {
    margin: 1em 0;
* Correct font family set oddly in IE 6, Safari 4/5, and Chrome.
code,
kbd,
pre,
samp {
    font-family: monospace, serif;
    _font-family: 'courier new', monospace;
    font-size: 1em;
* Improve readability of pre-formatted text in all browsers.
pre {
    white-space: pre;
    white-space: pre-wrap;
    word-wrap: break-word;
* Address CSS quotes not supported in IE 6/7.
q {
    quotes: none;
* Address `quotes` property not supported in Safari 4.
q:before,
q:after {
    content: '';
    content: none;
* Address inconsistent and variable font size in all browsers.
small {
    font-size: 80%;
* Prevent `sub` and `sup` affecting `line-height` in all browsers.
sub,
sup {
    font-size: 75%;
    line-height: 0;
    position: relative;
    vertical-align: baseline;
sup {
    top: -0.5em;
sub {
    bottom: -0.25em;
/* ==========================================================================
   Lists
   ========================================================================== */
* Address margins set differently in IE 6/7.
dl,
menu,
ol,
ul {
    margin: 1em 0;
dd {
    margin: 0 0 0 40px;
* Address paddings set differently in IE 6/7.
menu,
ol,
ul {
    padding: 0 0 0 40px;
* Correct list images handled incorrectly in IE 7.
nav ul,
nav ol {
    list-style: none;
    list-style-image: none;
/* ==========================================================================
   Embedded content
   ========================================================================== */
* 1. Remove border when inside `a` element in IE 6/7/8/9 and Firefox 3.
* 2. Improve image quality when scaled in IE 7.
img {
    border: 0; /* 1 */
    -ms-interpolation-mode: bicubic; /* 2 */
* Correct overflow displayed oddly in IE 9.
svg:not(:root) {
    overflow: hidden;
/* ==========================================================================
   Figures
   ========================================================================== */
* Address margin not present in IE 6/7/8/9, Safari 5, and Opera 11.
figure {
    margin: 0;
/* ==========================================================================
   Forms
   ========================================================================== */
* Correct margin displayed oddly in IE 6/7.
form {
    margin: 0;
* Define consistent border, margin, and padding.
fieldset {
    border: 1px solid #c0c0c0;
    margin: 0 2px;
    padding: 0.35em 0.625em 0.75em;
* 1. Correct color not being inherited in IE 6/7/8/9.
* 2. Correct text not wrapping in Firefox 3.
* 3. Correct alignment displayed oddly in IE 6/7.
legend {
    border: 0; /* 1 */
    padding: 0;
    white-space: normal; /* 2 */
    *margin-left: -7px; /* 3 */
* 1. Correct font size not being inherited in all browsers.
* 2. Address margins set differently in IE 6/7, Firefox 3+, Safari 5,
*    and Chrome.
* 3. Improve appearance and consistency in all browsers.
button,
input,
select,
textarea {
    font-size: 100%; /* 1 */
    margin: 0; /* 2 */
    vertical-align: baseline; /* 3 */
    *vertical-align: middle; /* 3 */
* Address Firefox 3+ setting `line-height` on `input` using `!important` in
* the UA stylesheet.
button,
input {
    line-height: normal;
* Address inconsistent `text-transform` inheritance for `button` and `select`.
* All other form control elements do not inherit `text-transform` values.
* Correct `button` style inheritance in Chrome, Safari 5+, and IE 6+.
* Correct `select` style inheritance in Firefox 4+ and Opera.
button,
select {
    text-transform: none;
* 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
*    and `video` controls.
* 2. Correct inability to style clickable `input` types in iOS.
* 3. Improve usability and consistency of cursor style between image-type
*    `input` and others.
* 4. Remove inner spacing in IE 7 without affecting normal text inputs.
*    Known issue: inner spacing remains in IE 6.
button,
html input[type="button"], /* 1 */
input[type="reset"],
input[type="submit"] {
    -webkit-appearance: button; /* 2 */
    cursor: pointer; /* 3 */
    *overflow: visible;  /* 4 */
* Re-set default cursor for disabled elements.
button[disabled],
html input[disabled] {
    cursor: default;
* 1. Address box sizing set to content-box in IE 8/9.
* 2. Remove excess padding in IE 8/9.
* 3. Remove excess padding in IE 7.
*    Known issue: excess padding remains in IE 6.
input[type="checkbox"],
input[type="radio"] {
    box-sizing: border-box; /* 1 */
    padding: 0; /* 2 */
    *height: 13px; /* 3 */
    *width: 13px; /* 3 */
* 1. Address `appearance` set to `searchfield` in Safari 5 and Chrome.
* 2. Address `box-sizing` set to `border-box` in Safari 5 and Chrome
*    (include `-moz` to future-proof).
input[type="search"] {
    -webkit-appearance: textfield; /* 1 */
    -moz-box-sizing: content-box;
    -webkit-box-sizing: content-box; /* 2 */
    box-sizing: content-box;
* Remove inner padding and search cancel button in Safari 5 and Chrome
* on OS X.
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
    -webkit-appearance: none;
* Remove inner padding and border in Firefox 3+.
button::-moz-focus-inner,
input::-moz-focus-inner {
    border: 0;
    padding: 0;
* 1. Remove default vertical scrollbar in IE 6/7/8/9.
* 2. Improve readability and alignment in all browsers.
textarea {
    overflow: auto; /* 1 */
    vertical-align: top; /* 2 */
/* ==========================================================================
   Tables
   ========================================================================== */
* Remove most spacing between table cells.
table {
    border-collapse: collapse;
    border-spacing: 0;