Horizontal sub menu

Question

I'd like to create horizontal submenu. Hovewer now I created only dopdown submenu. I have following css and html code, please see demo:

Can you help me improve my code? Thank you.

HTML

<ul id="menu-main-menu" class="top_big_menu"><li id="menu-item-4192" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-home menu-item-4192"><a href="#">Home</a></li>
<li id="menu-item-4159" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-4159"><a href="#">Football</a><ul>
        <li><a href="#">News</a></li>
        <li><a href="#">Interviews</a></li>
        <li><a href="#">Comments</a></li>
        </ul></li>
<li id="menu-item-4160" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-4160"><a href="#">Football 2</a><ul>
        <li><a href="#">News 2</a></li>
        <li><a href="#">Interviews 2</a></li>
        </ul></li>
<li id="menu-item-4161" class="menu-item menu-item-type-taxonomy menu-item-object-category current-menu-item menu-item-4161"><a href="#">Football 3</a><ul>
        <li><a href="http://www.example.com/child1.com">News 3</a></li>
        <li><a href="http://www.example.com/child2.com">Interviews 3</a></li>
        </ul></li>
<li id="menu-item-4190" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-4190"><a href="#">Menu 4</a></li>
<li id="menu-item-4189" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-4189"><a href="#">Menu 5</a></li>
</ul>

CSS

.top_big_menu li{
    display: inline-block;
    float: none;
    position: relative;
    bottom: -10px;
    float: left;
    margin-left:1px;
}

.top_big_menu li a{
    font-family: 'Calibri',sans-serif;
    font-weight: bold;
    font-size: 20px;
    color: #212121;
    text-transform: uppercase;
    display: block;
    padding-left: 20px;
    padding-right: 20px;
    line-height: 50px;
    border-top-left-radius: 5px;
    border-top-right-radius: 5px;
    -webkit-transition: all 0.2s;
    -moz-transition: all 0.2s;
    -ms-transition: all 0.2s;
    -o-transition: all 0.2s;
    transition: all 0.2s;
}

.top_big_menu li a:hover{
    background-color: #E31E24;
    color: #fff;
    text-decoration: none;
}

.top_big_menu  .current-menu-item a, .top_big_menu .current_page_item a{
    background-color: #E31E24;
    color: #fff;
}

.top_big_menu li ul{
display: none;
position:absolute;
z-index:2;
padding-bottom:13px;
}

.top_big_menu li:hover ul{ display:inline;
color:white;
background:#E31E24;
height:auto; 
border-bottom-left-radius: 5px;
border-bottom-right-radius: 5px;  }

https://jsfiddle.net/mart01/8vbnhxx0/

Answer 1

#menu-main-menu{
position: relative;
}

Apply the above code instead of applying position:relative to .top_big_menu li{} Check this link.