Conflict margin in css

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Well I have 2 classes being: 1 - container that receives some information 2 - top_menu that receives the menu.

I can not explain how this happens, but whenever I put a div with class container the menu creates a margin at the top.

Does anyone know why this happens?

If you remove the div container the menu is left blank, in the right way. But I need the div container . 

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: #FFFFFF;
}
.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;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><!--TopMenu--><divclass="top_menu">
  <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">TEXTO</h1>
    
asked by anonymous 24.05.2017 / 19:30

1 answer

2

Edited!

To fix this. Remove the float: left from the .horizontal-menu and .horizontal-menu li classes and add display: display: inline-block; to those two classes. See below: 

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: #FFFFFF;
}
.top_menu {
width: 100%;
}
ul.horizontal-menu, .horizontal-menu ul  {
list-style-type: none;
margin: 0;
padding: 0;
}
.horizontal-menu {
display: inline-block;
width:100%;
background: #616161;
}
.horizontal-menu li {
display: inline-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;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><!--TopMenu--><divclass="top_menu">
  <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">TEXTO</h1>
    
24.05.2017 / 20:22
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