:not(:first-child) and :not(:first-of-type) not working

That's because they are not siblings.

If you change the :not selector to the parent div, it will work.

.someContainer:not(:first-of-type)
{
    margin-top: 50px;
}

#someDivID
{
    width: 400px;
}

#someItem,
#someItem2
{
    border: 1px solid #000;
    padding: 1px;
    margin-bottom: 2px;
    clear: both;
    overflow: auto;
}

.someContainer
{
    background-color: #0077FF;
}

.someContainer:not(:first-of-type)
{
    margin-top: 50px;
}
<div id="someDivID">
    <div class="theBody">
        <div class="someContainer">
            <div id="someItem" class="someItemClass">
                Test
            </div>
        </div>
        <div class="someContainer">
            <div id="someItem2" class="someItemClass">
                Test2
            </div>
        </div>
    </div>
</div>

Tags:

Html

Css