<style>
    body{
        background:black;
    }
</style>

<h2>Titulo</h2>
<ul class="galeria">
    <li><div style="position:relative;width:100px; height:100px; background:yellow;"</div></li>
    <li><div style="position:relative;width:100px; height:320px; background:yellow;"</div></li>
    <li><div style="position:relative;width:100px; height:100px; background:yellow;"</div></li>
    <li><div style="position:relative;width:100px; height:100px; background:yellow;"</div></li>
    <li><div style="position:relative;width:100px; height:100px; background:yellow;"</div></li>
</ul>


<style>
.galeria {
    padding-right: 1em;
    text-align: center;
}

.galeria li {
    padding-left: 0.1em;
    padding-right: 0.1em;
    box-sizing: border-box;
    display: inline-block;
    width: 20%;
}
</style>