CSS margin dispute

I'm facing an issue with two CSS classes - container and top_menu. The top_menu should not have a margin on top when used within the container class, but it somehow does. Removing the container div resolves this. How can I resolve this problem?

Below is an example:

body {
                margin: 0;
                color:#484848;
                font-family: 'Verdana', sans-serif;
            }
            .container {
                left: 0;
                right: 0;
                margin: 10px auto 10px auto;
                width: 95%;
                border-radius: 4px;
                background: #e1e1e1;
            }
            .top_menu {
                width: 100%;
            }
            ul.horizontal-menu, .horizontal-menu ul  {
                list-style-type: none;
                margin: 0;
                padding: 0;
            }
            /* Rest of the CSS code */
            
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
            <!-- Top Menu -->
            <div class="top_menu">
            <ul class="horizontal-menu">
             <!-- List items for the menu -->
            </ul>
            </div>

            <!-- Container -->
            <div class="container">
             Container
            </div>

            <h1 class="txt-center">TEXT</h1>
htmlcssmargin

Answer №1

Your .top_menu has floated children, causing it to have a height of 0 on the page. To fix this issue and ensure proper layout, apply a clearfix technique to the menu. I've included a reusable .clearfix class for clearing floats within parent elements.

body {
    margin: 0;
    color:#484848;
    font-family: 'Verdana', sans-serif;
}
.container {
    left: 0;
    right: 0;
    margin: 10px auto 10px auto;
    width: 95%;
    border-radius: 4px;
    background: #e1e1e1;
}
.top_menu {
    width: 100%;
}
ul.horizontal-menu, .horizontal-menu ul  {
    list-style-type: none;
    margin: 0;
    padding: 0;
}
.horizontal-menu {
    float: left;
    width:100%;
    background: #616161;
}
.horizontal-menu li {
    float: left;
    display: block;
    padding: 25px;
    color: #FFFFFF;
    text-decoration: none;
    text-transform: uppercase;
    -webkit-transition: border-color .218s;
    -moz-transition: border .218s;
    -o-transition: border-color .218s;
    transition: border-color .218s;
    background: #616161;
    cursor: pointer;
}
.horizontal-menu li .material-icons {
    margin: -10px;
}
.hideshow ul li {
    width: 250px;
    text-align: center;
}
.horizontal-menu li:hover {
    border-bottom: 3px solid rgb(246,83,20);
    padding-bottom: 22px;
    background: #484848;
}
.horizontal-menu li.hideshow ul {
    position:absolute;
    display:none;
    left: -203px;
    width: 300px;
}
.horizontal-menu li.hideshow {
    position:relative;
}
.hideshow ul {
    padding-bottom: 7px;
    background: #616161;
    border-radius: 0px 0px 4px 4px;
    margin-top: 25px;
}
.top_menu_extra {
    background-color: #616161;
    width: 100%;
    display: none;
    border: 0 solid #484848;
    border-top-width: 1px;
}
.clearfix:after {
  content: "";
  display: table;
  clear: both;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Top Menu -->
<div class="top_menu clearfix">
  <ul class="horizontal-menu">
    <li id="sub">&nbsp;<i class="material-icons">search</i>&nbsp;</li>
    <li data-link="http://www.google.com">MENU 1</li>
    <li data-link="http://www.google.com">MENU 2</li>
    <li data-link="http://www.google.com">MENU 3</li>
    <li data-link="http://www.google.com">MENU 4</li>
    <li data-link="http://www.google.com">MENU 5</li>
    <li data-link="http://www.google.com">MENU 6</li>
    <li data-link="http://www.google.com">MENU 7</li>
    <li data-link="http://www.google.com">MENU 8</li>
    <li data-link="http://www.google.com">MENU 9</li>
    <li data-link="http://www.google.com">MENU 10</li>
    <li data-link="http://www.google.com">MENU 11</li>
  </ul>
</div>


<!-- Container -->
<div class="container">
  Container
</div>

<h1 class="txt-center">TEXT</h1>

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