Is there is possibility to have a full width dropdown with a wrapper that has a width of 1024px?

I have a question, is it possible to have a full width dropdown menu when my wrapper has a width of 1024 px? Because I am having problems with my dropdown menu. Though, it is not yet working with the hover but Im still trying to style my dropdown menu.

Here's my code..

from my index.html

<div id ="lower-header">
    <div class="wrapper">
        <img src="images/logo/logo_01.png">
        <ul>
            <li>
                <a href="#">KU 스타트업</a>
                    <div class="sub-menu-whole">
                        <div>
                            <img src="images/bg/bg_sub_01.png">
                        </div>
                        <div class="column">
                            <ul>
                                <li>
                                    <a>인사말</a>
                                </li>
                                <li>
                                    <a>창업부서소개</a>
                                </li>
                            </ul>
                        </div>                          
                    </div>
            </li>
            <li><a href="#">프로그램</a></li>
            <li><a href="#">스타트업 리더</a></li>
            <li><a href="#">창업보육</a></li>
            <li><a href="#">창업멘토단</a></li>
            <li><a href="#">커뮤니티</a></li>
        </ul>
    </div>
</div>

This is my CSS code: style.scss

#lower-header{
background-color: #ffffff;
height: 100px;
position: relative;
width: -webkit-fill-available;
z-index: 1;
    img {
        float: left;
        margin-top: 33px;
    }
    ul {
        list-style: none;
        display: block;
        float: left;
        margin: 17px 0px;
        padding-left: 30px;
        li {                
            display: inline-block;
            font-size: 17px;
            font-weight: bold;
            padding: 16px 19px;
            height: 73px;
        .sub-menu-whole {
            background-color: #ffffff;
            height: 360px; 
            /*position: absolute;*/
            z-index: 1;
            margin-top: 44px;
                &:after {
                    content: "";
                    display: table;
                    clear: both;
                }
            div {
                position: absolute;
                margin: -33px 0;
                padding: 0;
                div {
                    float:right;
                }
            }
        }
        a {
            text-decoration: none;
            color: #000000;

            &:hover {
                color: red;
            }                   
        }
    }
}

#html #css