The top of the page does not align with the HTML body even when the margin is set to 0

I am facing an issue with my Ruby on Rails app where the body content is not displaying at the top of the page. Here is a screenshot of the problem:

I have double-checked all the properties and everything seems to be set correctly. If you want to take a look at the complete source code of the application, you can find it here. Let me share how my view looks like:

<div id="header-wrap">
  <div id="header">
    <h1>Blog</h1>
  </div>
</div>

<div id="wrapper">
  <div id="posts">
    <% @posts.each do |post| %>
    <div id="post">
      <h2><%= post.title %></h2>
      <%= simple_format post.body %>
      <small>
        <%= link_to 'Edit', edit_post_path(post) %> |
        <%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %>
      </small>
    </div>
    <% end %>
  </div>

  <br>

  <%= link_to 'New Post', new_post_path %>
</div>

I have also included my CSS code below (the commented out section is a temporary fix I implemented by adjusting the positioning of the header-wrap and wrapper elements):

/*
 * This is a manifest file that'll be compiled into application.css, which will include all the files
 * listed below.
 *
 * Any CSS and SCSS file within this directory, lib/assets/stylesheets, vendor/assets/stylesheets,
 * or vendor/assets/stylesheets of plugins, if any, can be referenced here using a relative path.
 *
 * You're free to add application-wide styles to this file and they'll appear at the top of the
 * compiled file, but it's generally better to create a new file per style scope.
 *
 *= require_self
 *= require_tree .
 *= require twitter/bootstrap
 */
 html, body, {
    background-image:url('bg.png');
    background-color:#cccccc;
    padding: 0;
    margin: 0;
}

#header-wrap {
    background-color: #424242;
/*  position: absolute;*/
    height: 100px;
    width: 100%;
    top: 0;
}

#header {
    margin: 0 auto;
    color: #FFFFFF;
    width: 588px;
}

#wrapper {
/*  position: relative;
    top: 100px;*/
    padding: 0 6px;
    margin: 0 auto;
    width: 588px;
}

#posts {
}

#notice {
    color: green;
}

.field_with_errors {
    padding: 2px;
    background-color: red;
    display: table;
}

#error_explanation {
    width: 450px;
    border: 2px solid red;
    padding: 7px;
    padding-bottom: 0;
    margin-bottom: 20px;
    background-color: #f0f0f0;
    h2 {
    text-align: left;
    font-weight: bold;
    padding: 5px 5px 5px 15px;
    font-size: 12px;
    margin: -7px;
    margin-bottom: 0px;
    background-color: #c00;
    color: #fff;
    }
    ul li {
    font-size: 12px;
    list-style: square;
    }
}

Answer №1

Kindly review your header tag. Try running your code without <h1>Blog</h1>.

Then, insert

h1{
     margin: 0;
  }

while still retaining <h1>Blog</h1>.

UPDATED

Adjust

#header-wrap{ position:absolute;}
as your #header is contained within #header-wrap, and eliminate

h1{
         margin: 0;
      }

Answer №2

In order to prevent future CSS issues, it is recommended to include the "Reset CSS" at the beginning of your stylesheet.
Reset CSS

Answer №3

By inserting the code *{margin:0} into the CSS stylesheet, the body content will align to a margin of 0.

Answer №4

The issue I encountered was that the content body contained two alert paragraphs.

<p class="alert"><%= alert %></p>

Resolved by replacing the paragraphs with sections.

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