在Flexbox中垂直居中放置两个子元素
这个问题在这里已经有了答案:
  您可以使这些框display: flex; align-items: center; justify-content: center; display: flex; align-items: center; justify-content: center;  垂直和水平居中放置内容。 
body {
    background: #2F546B;
    margin: 0;
    font-family: 'Roboto', sans-serif;
}
#current {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
        flex-wrap: wrap;
}
.current_details {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
    width: 200px;
    height: 300px;
    margin: 5px 5px;
    text-align: center;
    border: 2px solid red;
}
.current_details div {
    font-size: 2em;
    border: 2px solid #fdfefe;
    display: flex;
    align-items: center;
    justify-content: center;
}
.current_details div:nth-child(1) {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
}
.current_details div:nth-child(2) {
    color: #000;
    background: #fdfefe;
    -webkit-box-flex: 2;
        -ms-flex: 2;
            flex: 2;
}<div id="current">
    <a ng-repeat="(key, value) in vm.currentQuotes" ng-href="#!/current/{{key}}">
        <div class="current_details">
            <div>AUD</div>
            <div>1.5045</div>
        </div>
    </a>
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