JSFiddle - React, Tailwind, and code Playground

HTML

<div class="postContainerHome">
    <div class="innerLeftPosts">
        <div class="mainPostHome">
            <div class="postSlideCover">
                <h3>Hello this is a test</h3>
                <p>This is some test content that would go in here and take up some space</p>
            </div>
        </div>
        <div class="secondaryPostHome">
            <div class="postSlideCover">
                <h3>Hello this is a test</h3>
                <p>This is some test content that would go in here and take up some space</p>
            </div>
        </div>
    </div>
    <div class="innerRightPosts">
        <div class="rightPostHome">
            <div class="postSlideCover">
                <h3>Hello this is a test</h3>
                <p>This is some test content that would go in here and take up some space</p>
            </div>
        </div>
        <div class="rightPostHome">
            <div class="postSlideCover">
                <h3>Hello this is a test</h3>
                <p>This is some test content that would go in here and take up some space</p>
            </div>
        </div>
        <div class="rightPostHome">
            <div class="postSlideCover">
                <h3>Hello this is a test</h3>
                <p>This is some test content that would go in here and take up some space</p>
            </div>
        </div>
    </div>
</div>

CSS

.postContainerHome > div > div > div{
	padding:10px;
}

.postContainerHome > div > div{
	background-size:cover;
	-webkit-background-size:cover;
}

.postContainerHome > div > div img{
	display:none;
}

.innerLeftPosts, .innerRightPosts{
	height:500px;
}

.innerLeftPosts > div, .innerRightPosts > div{
	overflow:hidden;
	position:relative;
}

.postSlideCover{
	width:calc(100% - 20px);
	height:auto;
	position:absolute;
	background: rgba(0,0,0,0); /* Old browsers */
background: -moz-linear-gradient(top, rgba(0,0,0,0) 0%, rgba(0,0,0,0.8) 65%, rgba(0,0,0,0.8) 65%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0)), color-stop(65%,rgba(0,0,0,0.8)), color-stop(65%,rgba(0,0,0,0.8))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(top, rgba(0,0,0,0) 0%,rgba(0,0,0,0.8) 65%,rgba(0,0,0,0.8) 65%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(top, rgba(0,0,0,0) 0%,rgba(0,0,0,0.8) 65%,rgba(0,0,0,0.8) 65%); /* Opera 11.10+ */
background: -ms-linear-gradient(top, rgba(0,0,0,0) 0%,rgba(0,0,0,0.8) 65%,rgba(0,0,0,0.8) 65%); /* IE10+ */
background: linear-gradient(to bottom, rgba(0,0,0,0) 0%,rgba(0,0,0,0.8) 65%,rgba(0,0,0,0.8) 65%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='rgba(0,0,0,0)', endColorstr='rgba(0,0,0,0.8)',GradientType=0 ); /* IE6-9 */
	transition:all 0.4s ease-out;
	-webkit-transition:all 0.4s ease-out;
    bottom: 0;
}

.mainPostHome .postSlideCover{
	transform: translateY(60%);
}

.mainPostHome:hover .postSlideCover{
	transform: translateY(0);
	bottom:0;
}

.innerLeftPosts{
	float:left;
	width:50%;
}

.innerRightPosts{
	float:right;
	width:50%;
}

.innerRightPosts > div{
	height:calc(500px/3);
	overflow:hidden;
}

.mainPostHome{
	background:#fec33e;
	height:calc(500px*(2/3));
}

.secondaryPostHome{
	background:#00588d;
	height:calc(500px*(1/3));
}

.secondaryPostHome > .postSlideCover{
	bottom: 0;
    transform: translateY(60%);
}

.secondaryPostHome:hover >...