How to move menu items under the main menu?

Question

css

I think that I need to increase the size of the main menu so that the menu fills the entire strip, but I do not understand how to do this.

<div class="header-bg-two">
            <div class="header-two">
                <ul>
                    <li class="header-item"><a href="#">Mac</a>
                        <ul>
                            <li><a href="#">IMac</a></li>
                            <li><a href="#">Mac Mini</a></li>
                            <li><a href="#">Macbook</a></li>
                            <li><a href="#">Mac Pro</a></li>
                        </ul>
                    </li>
                    <li class="header-item"><a href="#">Iphone</a></li>
                    <li class="header-item"><a href="#">Watch</a></li>
                    <li class="header-item"><a href="#">Аксессуары</a></li>
                    <li class="header-item"><a href="#">Акции</a></li>
                </ul>

                <div class="header-cart"><a href="#">Корзина</a></div>
            </div>
        </div>

.header-bg-two{
    background-color:#333333 ;
}

.header-two{
    max-width: 1170px;
    margin: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-two ul {
    display: flex;
    padding: 0 ;
    
}

.header-item li{
    height: 100%;
}

.header-item a{
    display: flex;
    color:#fff;
    font-size: 18px;
    padding-right: 30px;
    list-style-type: none;
    font-family: 'Raleway', sans-serif;
    height: 100%;

}

.header-cart a{
    display:flex;
    color: #fff;
    font-family: 'Raleway', sans-serif;
    font-weight: bold;
    
}

.header-item ul{
    display: none;
    position: absolute;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
    z-index: 1;
    color: #000;
    
}

.header-item:hover ul{
    display: block;
    
}

.header-item li a{
    color: #000;
}

Answer 1

To be added.header-item ulmargin-top: 16px;

Answer 2

Remove the links , set the width, for example 70% and write to itpadding-right
.header-two uljustify-content: space-between