SOURCE

<div>
	<ul>
		<li></li>
		<li></li>
	</ul>
</div>

div{
    padding: 0;
    margin: 0;
}

ul {
    width: 400px;
    height: 100px;
    border: 1px solid red;
    list-style: none;
    display: flex;
    justify-content: space-between;
}

ul li:nth-of-type(1) {
    width: 100px;
    height: 100px;
    list-style: none;
    background: blueviolet;
}

ul li:nth-of-type(2) {
    width: 100px;
    height: 100px;
    list-style: none;
    background: green;
}