嵌套元素不以兄弟姐妹

Question

在代码段中有一个向下箭头：#arrowDown。我正在努力让这个箭头置于标题和副标题下的中心位置。我使用班级.total-center将标题和副标题居中，然后将箭头的换行放在这个居中的div中。

有人看到为什么#arrowDown不像其他项目那样垂直和水平居中？

.total-center {
	text-align: center;
	position: absolute;
	top: 50%;
	left: 50%;
	-webkit-transform: translate(-50%, -50%);
	transform: translate(-50%, -50%);
	width: 100%;
}
#solMain {
	width: 100%;
	height: 100vh;
	background: red;
	background-repeat: no-repeat;
	background-size: 100% 100%;
	position: relative;
}
#solMainTitle, #solMainDesc {
	color: #FFF;
	text-shadow: 2px 2px #242424;
	line-height: 1.5em;
}
#solMainTitle {
	font-family: 'Muli', sans-serif;
	font-size: 1.7rem;
	font-weight: 800;
	text-transform: uppercase;
	margin-bottom: 50px;
}
#solMainDesc {
	font-family: 'Nunito', sans-serif;
	letter-spacing: .2rem;
	font-size: 1rem;
}
#arrowDownWrap {
	cursor: pointer;
	width: 25px;
	height: 25px;
	position: relative;
	text-align: center;
}
#arrowDownWrapInner {
	bottom: 40px;
	position: relative;
}
#arrowDown, #arrowDown2 {
    border: solid #FFF;
    border-width: 0 3px 3px 0;
	width: 25px;
	height: 25px;
    display: block;
    padding: 3px;
	-webkit-transform: rotate(45deg);transform: rotate(45deg);
	-webkit-transition: all 0.5s;transition: all 0.5s;
	position: absolute;
	top: 0;
	left: 0;
}
#arrowDownWrap:hover #arrowDown2 {
	-webkit-transform: translate(0,40px) rotate(45deg) ;transform: translate(0,40px) rotate(45deg);
	-webkit-transition: all 0.5s;transition: all 0.5s;
}

<section id="solMain">
	<div class="total-center">
		<h1 id="solMainTitle">Title Text</h1>
		<span id="solMainDesc">Subtitle text</span>
		<div id="arrowDownWrap">
			<div id="arrowDownWrapInner">
				<i id="arrowDown"></i>
				<i id="arrowDown2"></i>
			</div>
		</div>
	</div>
</section>